{"id":19262,"date":"2022-02-07T15:11:32","date_gmt":"2022-02-07T07:11:32","guid":{"rendered":"https:\/\/smartairfilters.com\/?page_id=19262"},"modified":"2024-01-19T12:10:30","modified_gmt":"2024-01-19T04:10:30","slug":"when-change-hepa-filter","status":"publish","type":"page","link":"https:\/\/smartairfilters.com\/en\/when-change-hepa-filter\/","title":{"rendered":"Determining When to Change Your HEPA Filter"},"content":{"rendered":"<p>Use this simple tool to determine how often you need to replace or your air purifier&#8217;s HEPA filter. It just takes 4 simple steps:<\/p>\n\n\n<div class=\"gb-container gb-container-9cb2a7dd lifespan-calculator-div\"><div class=\"gb-inside-container\">\n\n<div class=\"wpcf7 no-js\" id=\"wpcf7-f19265-o1\" lang=\"en-US\" dir=\"ltr\" data-wpcf7-id=\"19265\">\n<div class=\"screen-reader-response\"><p role=\"status\" aria-live=\"polite\" aria-atomic=\"true\"><\/p> <ul><\/ul><\/div>\n<form action=\"\/en\/wp-json\/wp\/v2\/pages\/19262#wpcf7-f19265-o1\" method=\"post\" class=\"wpcf7-form init\" id=\"lifespan-calculator\" aria-label=\"Contact form\" novalidate=\"novalidate\" data-status=\"init\">\n<fieldset class=\"hidden-fields-container\"><input type=\"hidden\" name=\"_wpcf7\" value=\"19265\" \/><input type=\"hidden\" name=\"_wpcf7_version\" value=\"6.1.5\" \/><input type=\"hidden\" name=\"_wpcf7_locale\" value=\"en_US\" \/><input type=\"hidden\" name=\"_wpcf7_unit_tag\" value=\"wpcf7-f19265-o1\" \/><input type=\"hidden\" name=\"_wpcf7_container_post\" value=\"0\" \/><input type=\"hidden\" name=\"_wpcf7_posted_data_hash\" value=\"\" \/>\n<\/fieldset>\n<p><label> 1. Select an Air Purifier:<br \/>\n<span class=\"wpcf7-form-control-wrap\" data-name=\"purifier\"><select class=\"wpcf7-form-control wpcf7-select wpcf7-validates-as-required\" id=\"purifier\" aria-required=\"true\" aria-invalid=\"false\" name=\"purifier\"><option value=\"\">&#8212;Please choose an option&#8212;<\/option><option value=\"DIY1.1\">DIY1.1<\/option><option value=\"QT3\">QT3<\/option><option value=\"Sqair\">Sqair<\/option><option value=\"SA600\">SA600<\/option><option value=\"Blast Mini\">Blast Mini<\/option><option value=\"Blast\">Blast<\/option><\/select><\/span> <\/label>\n<\/p>\n<p><label> 2. Select a Country:<br \/>\n<span class=\"wpcf7-form-control-wrap\" data-name=\"country\"><select class=\"wpcf7-form-control wpcf7-select\" id=\"country\" aria-invalid=\"false\" name=\"country\"><option value=\"\">&#8212;Please choose an option&#8212;<\/option><option value=\"Afghanistan\">Afghanistan<\/option><option value=\"Albania\">Albania<\/option><option value=\"Algeria\">Algeria<\/option><option value=\"American Samoa\">American Samoa<\/option><option value=\"Andorra\">Andorra<\/option><option value=\"Angola\">Angola<\/option><option value=\"Anguilla\">Anguilla<\/option><option value=\"Antigua and Barbuda\">Antigua and Barbuda<\/option><option value=\"Argentina\">Argentina<\/option><option value=\"Armenia\">Armenia<\/option><option value=\"Armenia\">Armenia<\/option><option value=\"Aruba\">Aruba<\/option><option value=\"Australia\">Australia<\/option><option value=\"Austria\">Austria<\/option><option value=\"Azerbaijan\">Azerbaijan<\/option><option value=\"Azerbaijan\">Azerbaijan<\/option><option value=\"Bahamas\">Bahamas<\/option><option value=\"Bahrain\">Bahrain<\/option><option value=\"Bangladesh\">Bangladesh<\/option><option value=\"Barbados\">Barbados<\/option><option value=\"Belarus\">Belarus<\/option><option value=\"Belgium\">Belgium<\/option><option value=\"Belize\">Belize<\/option><option value=\"Benin\">Benin<\/option><option value=\"Bermuda\">Bermuda<\/option><option value=\"Bhutan\">Bhutan<\/option><option value=\"Bolivia\">Bolivia<\/option><option value=\"Bonaire\">Bonaire<\/option><option value=\"Bosnia and Herzegovina\">Bosnia and Herzegovina<\/option><option value=\"Botswana\">Botswana<\/option><option value=\"Bouvet Island (Bouvetoya)\">Bouvet Island (Bouvetoya)<\/option><option value=\"Brazil\">Brazil<\/option><option value=\"British Indian Ocean Territory (Chagos Archipelago)\">British Indian Ocean Territory (Chagos Archipelago)<\/option><option value=\"British Virgin Islands\">British Virgin Islands<\/option><option value=\"Brunei Darussalam\">Brunei Darussalam<\/option><option value=\"Bulgaria\">Bulgaria<\/option><option value=\"Burkina Faso\">Burkina Faso<\/option><option value=\"Burundi\">Burundi<\/option><option value=\"Cambodia\">Cambodia<\/option><option value=\"Cameroon\">Cameroon<\/option><option value=\"Canada\">Canada<\/option><option value=\"Cape Verde\">Cape Verde<\/option><option value=\"Cayman Islands\">Cayman Islands<\/option><option value=\"Central African Republic\">Central African Republic<\/option><option value=\"Chad\">Chad<\/option><option value=\"Chile\">Chile<\/option><option value=\"China\">China<\/option><option value=\"Christmas Island\">Christmas Island<\/option><option value=\"Cocos (Keeling) Islands\">Cocos (Keeling) Islands<\/option><option value=\"Colombia\">Colombia<\/option><option value=\"Comoros\">Comoros<\/option><option value=\"Congo\">Congo<\/option><option value=\"Congo\">Congo<\/option><option value=\"Cook Islands\">Cook Islands<\/option><option value=\"Costa Rica\">Costa Rica<\/option><option value=\"Cote d&#039;Ivoire\">Cote d&#039;Ivoire<\/option><option value=\"Croatia\">Croatia<\/option><option value=\"Cuba\">Cuba<\/option><option value=\"Cura\u00e7ao\">Cura\u00e7ao<\/option><option value=\"Cyprus\">Cyprus<\/option><option value=\"Cyprus\">Cyprus<\/option><option value=\"Czech Republic\">Czech Republic<\/option><option value=\"Denmark\">Denmark<\/option><option value=\"Djibouti\">Djibouti<\/option><option value=\"Dominica\">Dominica<\/option><option value=\"Dominican Republic\">Dominican Republic<\/option><option value=\"Ecuador\">Ecuador<\/option><option value=\"Egypt\">Egypt<\/option><option value=\"El Salvador\">El Salvador<\/option><option value=\"Equatorial Guinea\">Equatorial Guinea<\/option><option value=\"Eritrea\">Eritrea<\/option><option value=\"Estonia\">Estonia<\/option><option value=\"Ethiopia\">Ethiopia<\/option><option value=\"Falkland Islands (Malvinas)\">Falkland Islands (Malvinas)<\/option><option value=\"Faroe Islands\">Faroe Islands<\/option><option value=\"Fiji\">Fiji<\/option><option value=\"Finland\">Finland<\/option><option value=\"France\">France<\/option><option value=\"French Guiana\">French Guiana<\/option><option value=\"French Polynesia\">French Polynesia<\/option><option value=\"French Southern Territories\">French Southern Territories<\/option><option value=\"Gabon\">Gabon<\/option><option value=\"Gambia\">Gambia<\/option><option value=\"Georgia\">Georgia<\/option><option value=\"Germany\">Germany<\/option><option value=\"Ghana\">Ghana<\/option><option value=\"Gibraltar\">Gibraltar<\/option><option value=\"Greece\">Greece<\/option><option value=\"Greenland\">Greenland<\/option><option value=\"Grenada\">Grenada<\/option><option value=\"Guadeloupe\">Guadeloupe<\/option><option value=\"Guam\">Guam<\/option><option value=\"Guatemala\">Guatemala<\/option><option value=\"Guernsey\">Guernsey<\/option><option value=\"Guinea\">Guinea<\/option><option value=\"Guinea-Bissau\">Guinea-Bissau<\/option><option value=\"Guyana\">Guyana<\/option><option value=\"Haiti\">Haiti<\/option><option value=\"Heard Island and McDonald Islands\">Heard Island and McDonald Islands<\/option><option value=\"Holy See (Vatican City State)\">Holy See (Vatican City State)<\/option><option value=\"Honduras\">Honduras<\/option><option value=\"Hong Kong\">Hong Kong<\/option><option value=\"Hungary\">Hungary<\/option><option value=\"Iceland\">Iceland<\/option><option value=\"India\">India<\/option><option value=\"Indonesia\">Indonesia<\/option><option value=\"Iran\">Iran<\/option><option value=\"Iraq\">Iraq<\/option><option value=\"Ireland\">Ireland<\/option><option value=\"Isle of Man\">Isle of Man<\/option><option value=\"Israel\">Israel<\/option><option value=\"Italy\">Italy<\/option><option value=\"Jamaica\">Jamaica<\/option><option value=\"Japan\">Japan<\/option><option value=\"Jersey\">Jersey<\/option><option value=\"Jordan\">Jordan<\/option><option value=\"Kazakhstan\">Kazakhstan<\/option><option value=\"Kazakhstan\">Kazakhstan<\/option><option value=\"Kenya\">Kenya<\/option><option value=\"Kiribati\">Kiribati<\/option><option value=\"Korea\">Korea<\/option><option value=\"Korea\">Korea<\/option><option value=\"Kuwait\">Kuwait<\/option><option value=\"Kyrgyz Republic\">Kyrgyz Republic<\/option><option value=\"Lao People&#039;s Democratic Republic\">Lao People&#039;s Democratic Republic<\/option><option value=\"Latvia\">Latvia<\/option><option value=\"Lebanon\">Lebanon<\/option><option value=\"Lesotho\">Lesotho<\/option><option value=\"Liberia\">Liberia<\/option><option value=\"Libyan Arab Jamahiriya\">Libyan Arab Jamahiriya<\/option><option value=\"Liechtenstein\">Liechtenstein<\/option><option value=\"Lithuania\">Lithuania<\/option><option value=\"Luxembourg\">Luxembourg<\/option><option value=\"Macao\">Macao<\/option><option value=\"Macedonia\">Macedonia<\/option><option value=\"Madagascar\">Madagascar<\/option><option value=\"Malawi\">Malawi<\/option><option value=\"Malaysia\">Malaysia<\/option><option value=\"Maldives\">Maldives<\/option><option value=\"Mali\">Mali<\/option><option value=\"Malta\">Malta<\/option><option value=\"Marshall Islands\">Marshall Islands<\/option><option value=\"Martinique\">Martinique<\/option><option value=\"Mauritania\">Mauritania<\/option><option value=\"Mauritius\">Mauritius<\/option><option value=\"Mayotte\">Mayotte<\/option><option value=\"Mexico\">Mexico<\/option><option value=\"Micronesia\">Micronesia<\/option><option value=\"Moldova\">Moldova<\/option><option value=\"Monaco\">Monaco<\/option><option value=\"Mongolia\">Mongolia<\/option><option value=\"Montenegro\">Montenegro<\/option><option value=\"Montserrat\">Montserrat<\/option><option value=\"Morocco\">Morocco<\/option><option value=\"Mozambique\">Mozambique<\/option><option value=\"Myanmar\">Myanmar<\/option><option value=\"Namibia\">Namibia<\/option><option value=\"Nauru\">Nauru<\/option><option value=\"Nepal\">Nepal<\/option><option value=\"Netherlands\">Netherlands<\/option><option value=\"Netherlands Antilles\">Netherlands Antilles<\/option><option value=\"New Caledonia\">New Caledonia<\/option><option value=\"New Zealand\">New Zealand<\/option><option value=\"Nicaragua\">Nicaragua<\/option><option value=\"Niger\">Niger<\/option><option value=\"Nigeria\">Nigeria<\/option><option value=\"Niue\">Niue<\/option><option value=\"Norfolk Island\">Norfolk Island<\/option><option value=\"Northern Mariana Islands\">Northern Mariana Islands<\/option><option value=\"Norway\">Norway<\/option><option value=\"Oman\">Oman<\/option><option value=\"Pakistan\">Pakistan<\/option><option value=\"Palau\">Palau<\/option><option value=\"Palestinian Territory\">Palestinian Territory<\/option><option value=\"Panama\">Panama<\/option><option value=\"Papua New Guinea\">Papua New Guinea<\/option><option value=\"Paraguay\">Paraguay<\/option><option value=\"Peru\">Peru<\/option><option value=\"Philippines\">Philippines<\/option><option value=\"Pitcairn Islands\">Pitcairn Islands<\/option><option value=\"Poland\">Poland<\/option><option value=\"Portugal\">Portugal<\/option><option value=\"Puerto Rico\">Puerto Rico<\/option><option value=\"Qatar\">Qatar<\/option><option value=\"Reunion\">Reunion<\/option><option value=\"Romania\">Romania<\/option><option value=\"Russian Federation\">Russian Federation<\/option><option value=\"Rwanda\">Rwanda<\/option><option value=\"Saint Barthelemy\">Saint Barthelemy<\/option><option value=\"Saint Helena\">Saint Helena<\/option><option value=\"Saint Kitts and Nevis\">Saint Kitts and Nevis<\/option><option value=\"Saint Lucia\">Saint Lucia<\/option><option value=\"Saint Martin\">Saint Martin<\/option><option value=\"Saint Pierre and Miquelon\">Saint Pierre and Miquelon<\/option><option value=\"Saint Vincent and the Grenadines\">Saint Vincent and the Grenadines<\/option><option value=\"Samoa\">Samoa<\/option><option value=\"San Marino\">San Marino<\/option><option value=\"Sao Tome and Principe\">Sao Tome and Principe<\/option><option value=\"Saudi Arabia\">Saudi Arabia<\/option><option value=\"Senegal\">Senegal<\/option><option value=\"Serbia\">Serbia<\/option><option value=\"Seychelles\">Seychelles<\/option><option value=\"Sierra Leone\">Sierra Leone<\/option><option value=\"Singapore\">Singapore<\/option><option value=\"Sint Maarten (Netherlands)\">Sint Maarten (Netherlands)<\/option><option value=\"Slovakia (Slovak Republic)\">Slovakia (Slovak Republic)<\/option><option value=\"Slovenia\">Slovenia<\/option><option value=\"Solomon Islands\">Solomon Islands<\/option><option value=\"Somalia\">Somalia<\/option><option value=\"South Africa\">South Africa<\/option><option value=\"South Georgia &amp; S. Sandwich Islands\">South Georgia &amp; S. Sandwich Islands<\/option><option value=\"Spain\">Spain<\/option><option value=\"Sri Lanka\">Sri Lanka<\/option><option value=\"Sudan\">Sudan<\/option><option value=\"Suriname\">Suriname<\/option><option value=\"Svalbard &amp; Jan Mayen Islands\">Svalbard &amp; Jan Mayen Islands<\/option><option value=\"Swaziland\">Swaziland<\/option><option value=\"Sweden\">Sweden<\/option><option value=\"Switzerland\">Switzerland<\/option><option value=\"Syrian Arab Republic\">Syrian Arab Republic<\/option><option value=\"Taiwan\">Taiwan<\/option><option value=\"Tajikistan\">Tajikistan<\/option><option value=\"Tanzania\">Tanzania<\/option><option value=\"Thailand\">Thailand<\/option><option value=\"Timor-Leste\">Timor-Leste<\/option><option value=\"Togo\">Togo<\/option><option value=\"Tokelau\">Tokelau<\/option><option value=\"Tonga\">Tonga<\/option><option value=\"Trinidad and Tobago\">Trinidad and Tobago<\/option><option value=\"Tunisia\">Tunisia<\/option><option value=\"Turkey\">Turkey<\/option><option value=\"Turkey\">Turkey<\/option><option value=\"Turkmenistan\">Turkmenistan<\/option><option value=\"Turks and Caicos Islands\">Turks and Caicos Islands<\/option><option value=\"Tuvalu\">Tuvalu<\/option><option value=\"U.S. Virgin Islands\">U.S. Virgin Islands<\/option><option value=\"U.S. Minor Outlying Islands\">U.S. Minor Outlying Islands<\/option><option value=\"Uganda\">Uganda<\/option><option value=\"Ukraine\">Ukraine<\/option><option value=\"United Arab Emirates\">United Arab Emirates<\/option><option value=\"United Kingdom\">United Kingdom<\/option><option value=\"United States of America\">United States of America<\/option><option value=\"Uruguay\">Uruguay<\/option><option value=\"Uzbekistan\">Uzbekistan<\/option><option value=\"Vanuatu\">Vanuatu<\/option><option value=\"Venezuela\">Venezuela<\/option><option value=\"Vietnam\">Vietnam<\/option><option value=\"Wallis and Futuna\">Wallis and Futuna<\/option><option value=\"Western Sahara\">Western Sahara<\/option><option value=\"Yemen\">Yemen<\/option><option value=\"Zambia\">Zambia<\/option><option value=\"Zimbabwe\">Zimbabwe<\/option><\/select><\/span> <\/label>\n<\/p>\n<p><label> 3. Enter your usage in hours per day:<br \/>\n<span class=\"wpcf7-form-control-wrap\" data-name=\"hours\"><input class=\"wpcf7-form-control wpcf7-number wpcf7-validates-as-required wpcf7-validates-as-number\" id=\"hours\" min=\"0\" max=\"24\" aria-required=\"true\" aria-invalid=\"false\" value=\"8\" type=\"number\" name=\"hours\" \/><\/span> <\/label>\n<\/p>\n<p><label>4. When did you last change your filter:<br \/>\n<span class=\"wpcf7-form-control-wrap\" data-name=\"date-changed\"><input class=\"wpcf7-form-control wpcf7-date wpcf7-validates-as-date\" id=\"date-changed\" aria-invalid=\"false\" value=\"\" type=\"date\" name=\"date-changed\" \/><\/span><\/label>\n<\/p>\n<p><span class=\"wpcf7-form-control-wrap\" data-name=\"ignore-date\"><span class=\"wpcf7-form-control wpcf7-checkbox\" id=\"ignore-date\"><span class=\"wpcf7-list-item first last\"><label><input type=\"checkbox\" name=\"ignore-date[]\" value=\"Ignore date &amp; only show HEPA lifespan\" \/><span class=\"wpcf7-list-item-label\">Ignore date &amp; only show HEPA lifespan<\/span><\/label><\/span><\/span><\/span>\n<\/p>\n<p><input class=\"wpcf7-form-control wpcf7-submit has-spinner\" id=\"calculate\" type=\"submit\" value=\"Calculate HEPA Lifespan\" \/>\n<\/p>\n<p><script type=\"text\/javascript\">\njQuery(document).ready(function(jQuery){\njQuery(\".wpcf7-form-control\").prop('required',true);\njQuery(\".wpcf7-form\").removeAttr('novalidate');\njQuery(\".change_date_info\").hide();\njQuery(\"#mauticform_wrapper_hepareminderform\").hide();\n});\n jQuery(\"#ignore-date\").click(function(e) {\n var date_changed = jQuery(\"#date-changed\");\n var input = jQuery(this).find(\"input\");\n var checked = input.prop('checked');\n if(checked) {\n date_changed.prop('aria-required', false);\n date_changed.prop('required', false);\n date_changed.prop('disabled', true);\n } else {\n date_changed.prop('aria-required', true);\n date_changed.prop('required', true);\n date_changed.prop('disabled', false);\n }\n\n\n});\n jQuery(\"#calculate\").click(function(event) {\n event.preventDefault();\n var form = jQuery(\"#lifespan-calculator\");\n if (! form[0].checkValidity()) {\n form[0].reportValidity();\n return;\n }\n form.fadeTo('fast', 0.5).attr('disabled', 'disabled');\n var loading = jQuery(\"#loading\");\n loading.fadeTo('fast', 1);\n var hours = parseFloat(jQuery(\"#hours\").val());\n var purifier = jQuery(\"#purifier\").val();\n var country = jQuery(\"#country\").val();\n var change_date = jQuery(\"#date-changed\").val();\n var pm25 = {\"Albania\": 14.5,\n\"Andorra\": 10.0,\n\"Australia\": 7.0,\n\"Austria\": 12.9,\n\"Bahrain\": 56.0,\n\"Bangladesh\": 71.3,\n\"Belgium\": 12.8,\n\"Bosnia and Herzegovina\": 52.7,\n\"Brazil\": 13.1,\n\"Bulgaria\": 21.4,\n\"Cameroon\": 82.7,\n\"Canada\": 6.9,\n\"Chile\": 26.9,\n\"China\": 40.7,\n\"Colombia\": 25.4,\n\"Costa Rica\": 24.3,\n\"Croatia\": 17.0,\n\"Cuba\": 35.0,\n\"Cyprus\": 14.8,\n\"Czechia\": 18.6,\n\"Denmark\": 10.7,\n\"Ecuador\": 14.5,\n\"El Salvador\": 27.0,\n\"Estonia\": 5.0,\n\"Fiji\": 8.0,\n\"Finland\": 5.7,\n\"France\": 11.8,\n\"Georgia\": 21.0,\n\"Germany\": 12.2,\n\"Ghana\": 55.0,\n\"Greece\": 16.1,\n\"Guatemala\": 38.0,\n\"Hungary\": 14.8,\n\"Iceland\": 7.7,\n\"India\": 83.1,\n\"Indonesia\": 39.0,\n\"Iran\":\t32.8,\n\"Ireland\": 8.0,\n\"Israel\": 22.2,\n\"Italy\": 16.4,\n\"Japan\": 15.0,\n\"Jordan\": 19.0,\n\"Kenya\": 17.0,\n\"Kuwait\": 47.3,\n\"Latvia\": 13.8,\n\"Lebanon\": 30.3,\n\"Liberia\": 9.5,\n\"Lithuania\": 13.3,\n\"Luxembourg\": 12.2,\n\"Madagascar\": 37.0,\n\"Malta\": 12.3,\n\"Mexico\": 23.4,\n\"Mongolia\": 92.0,\n\"Montenegro\": 16.0,\n\"Morocco\": 29.0,\n\"Nepal\": 49.0,\n\"Netherlands\": 11.3,\n\"New Zealand\": 10.8,\n\"Norway\": 7.6,\n\"Pakistan\": 79.3,\n\"Panama\": 14.0,\n\"Paraguay\": 18.0,\n\"Peru\": 39.0,\n\"Philippines\": 28.0,\n\"Poland\": 22.4,\n\"Portugal\": 7.7,\n\"Republic of Korea\": 25.4,\n\"Romania\": 15.9,\n\"Russian Federation\": 14.0,\n\"Saudi Arabia\": 65.5,\n\"Senegal\": 21.0,\n\"Serbia\": 23.0,\n\"Singapore\": 18.0,\n\"Slovakia\": 17.6,\n\"Slovenia\": 17.3,\n\"South Africa\": 28.2,\n\"Spain\": 8.5,\n\"Sweden\": 5.7,\n\"Switzerland\": 9.8,\n\"Thailand\": 28.0,\n\"The former Yugoslav Republic of Macedonia\": 40.0,\n\"Turkey\": 23.5,\n\"Uganda\": 104.0,\n\"Ukraine\": 22.0,\n\"United Kingdom\": 10.2,\n\"United Republic of Tanzania\": 23.0,\n\"United States of America\": 8.0,\n\"Uruguay\": 8.0,\n\"Vietnam\": 45.0}\nvar Cout = pm25[country];\nconst kv = 1.0;\nconst Pp = 0.8;\nconst ko = 0.2;\nconst h = 2.4;\nconst ccms = {\n \"QT3\": 640,\n \"DIY1.1\":1200,\n \"Sqair\":4000,\n \"SA600\":7400,\n \"Blast Mini\":18000,\n \"Blast\":45800}\n const S = {\n \"QT3\":12,\n \"DIY1.1\":15,\n \"Sqair\":40,\n \"SA600\":55,\n \"Blast Mini\":85,\n \"Blast\": 130\n }\nCout = Cout === undefined ? 30 : Cout; \/\/ if country doesn't exist in the list, then use a bog-standard number of 30 - WHO gives average of all cities as 21, but to take into account that there are more measurements in developed countries where PM2.5 is lower, we double this.\nvar Ct = Math.floor(Cout*0.1); \/\/ make indoor levels 10% of outdoor levels;\nCt = Cout < 20 ? 0 : Ct; \/\/ for places with really low outdoor levels, make the indoor requirement 0 - more conservative\nCout = Cout < 25 ? (20 + Cout*0.25) : Cout; \/\/ for really low outdoor pollution levels, it's possible that indoor particulate might be higher (dust, pet hair etc.) so we artificially increase the number by 50%\nvar mac = (kv*Pp*Cout - (ko + kv)*Ct)*S[purifier]*h*hours\/1000;\nvar days = ccms[purifier]\/mac;\nvar res_hours = Math.floor(days*hours\/50.0)*50;\nvar months = Math.floor(days\/30);\nsetTimeout(() => {\nloading.fadeTo('fast', 0);\nform.fadeTo('fast', 1). removeAttr('disabled');\njQuery(\"#res_lifespan_months\").text(months);\njQuery(\"#res_lifespan_hours\").text(res_hours);\nvar has_change_date = change_date !== null && change_date.length;\nchange_date = change_date ? Date.parse(change_date) : new Date().getTime();\nnew_change_date = new Date(change_date + months*30*24*60*60*1000);\njQuery(\"#res_change_date\").text(new_change_date.toLocaleDateString('en', {day: 'numeric', month: 'long', year: 'numeric'}));\njQuery(\"#mauticform_input_hepareminderform_replacement_date\").val(new_change_date.toISOString().split('T')[0]);\njQuery(\"#mauticform_input_hepareminderform_purifier\").val(purifier);\nif (has_change_date) {\njQuery(\".change_date_info\").show();\njQuery(\"#mauticform_wrapper_hepareminderform\").show();\n} else {\njQuery(\".change_date_info\").hide();\njQuery(\"#mauticform_wrapper_hepareminderform\").hide();\n}\njQuery(\"#res\").fadeTo('fast', 1);\n}, 1500);\n });\n\/\/ populate fields from request URL\nlet params = new URLSearchParams(window.location.search)\nfor (const [key, value] of params) {\n var elem = jQuery(\"#\" + key);\n if (elem.length) {\n if (elem.is(\"select\")) {\n jQuery(\"select[name=\" + key + \"] option[value=\" + value + \"]\").attr('selected', 'selected');\n } else {\n elem.attr('value', value);\n }\n }\n}\nif (params.has('submit') && params.get('submit') === 'true') {\njQuery(\"#calculate\").click();\n}\n<\/script>\n<\/p><p style=\"display: none !important;\" class=\"akismet-fields-container\" data-prefix=\"_wpcf7_ak_\"><label>&#916;<textarea name=\"_wpcf7_ak_hp_textarea\" cols=\"45\" rows=\"8\" maxlength=\"100\"><\/textarea><\/label><input type=\"hidden\" id=\"ak_js_1\" name=\"_wpcf7_ak_js\" value=\"156\"\/><script>document.getElementById( \"ak_js_1\" ).setAttribute( \"value\", ( new Date() ).getTime() );<\/script><\/p><div class=\"wpcf7-response-output\" aria-hidden=\"true\"><\/div>\n<\/form>\n<\/div>\n\n\n\n\n<p><\/p>\n\n\n\n<div id=\"loading\"><\/div><div id=\"res\" style=\"display:none\">\n<h3>Result<\/h3>\n<div class=\"change_date_info\"><span class=\"result\">Change your filter by: <\/span><span id=\"res_change_date\"><\/span>\n<span id=\"explainer\">You should change your filter by this date to ensure maximum performance of your air purifier.<\/span><\/div>\n<span class=\"result\">HEPA Filter Lifespan: <span id=\"res_lifespan_months\"><\/span> months<\/span> (or <span id=\"res_lifespan_hours\"><\/span> hours).\n<span id=\"explainer\">This is the amount of time you can expect to run your air purifier before needing to change your filters. However, you should still check your HEPA filter at regular intervals, and wash any pre-filters if your purifier has them.<\/span>\n\n<\/div><\/div>\n\n\n<h5 class=\"wp-block-heading change_date_info\">Email Me a Reminder:<\/h5>\n\n\n<script type=\"text\/javascript\" src=\"https:\/\/mailing.smartairfilters.com\/form\/generate.js?id=28\"><\/script>\n\n\n\n<h3 class=\"wp-block-heading\">Need a Fresh HEPA Filter?<\/h3>\n\n\n\n<p>A dirty filter can reduce the performance of your air purifier significantly, giving you less clean air.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button aligncenter\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/smartairfilters.com\/en\/shop\/\">Order a new HEPA filter now \u2192<\/a><\/div>\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n<div class=\"gb-container gb-container-034b90ff\"><div class=\"gb-inside-container\">\n\n<p><\/p>\n\n\n\n<h3 class=\"gb-headline gb-headline-743d26df gb-headline-text\">Nerd Corner<\/h3>\n\n\n\n<p>The exact time you can use your filter will depend on many local factors specific to you and how you use the purifier. Dive into what factors affect your HEPA filter&#8217;s lifespan and the details on how often you should change your HEPA filter here: <a href=\"https:\/\/smartairfilters.com\/en\/blog\/when-to-change-your-air-purifiers-hepa-filter\/\">How to Know When to Change Your Air Purifier\u2019s HEPA Filter \u00bb<\/a><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">How this Calculator Works<\/h4>\n\n\n\n<p style=\"font-size:15px\">This calculator uses air pollution data from the World Health Organization to calculate the approximate time a HEPA filter will last in a specific country or region [<a href=\"https:\/\/www.who.int\/data\/gho\/data\/themes\/air-pollution\/who-air-quality-database\">source<\/a>]. A HEPA filter is deemed in need of replacing once the its effectiveness at providing clean air has dropped to 50% of its initial value.<\/p>\n\n<\/div><\/div>\n\n\n<p><\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>Use this simple tool to determine how often you need to replace or your air purifier&#8217;s HEPA filter. It just takes 4 simple steps: Result Change your filter by: You should change your filter by this date to ensure maximum performance of your air purifier. HEPA Filter Lifespan: months (or &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Determining When to Change Your HEPA Filter\" class=\"read-more button\" href=\"https:\/\/smartairfilters.com\/en\/when-change-hepa-filter\/#more-19262\" aria-label=\"Read more about Determining When to Change Your HEPA Filter\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"4928,7830,10414,6602,12577,11976","_relevanssi_noindex_reason":"","footnotes":""},"class_list":["post-19262","page","type-page","status-publish"],"acf":[],"_links":{"self":[{"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/pages\/19262","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/comments?post=19262"}],"version-history":[{"count":41,"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/pages\/19262\/revisions"}],"predecessor-version":[{"id":28754,"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/pages\/19262\/revisions\/28754"}],"wp:attachment":[{"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/media?parent=19262"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}