{"product_id":"20x21-5-8x1-air-filter","title":"20x21 5\/8x1 Aerostar Air Filter","description":"A 20 x 21 5\/8 x 1 nominal return is one of those odd specs that comes from a custom or semi-custom HVAC installation. This Aerostar measures 20\" x 21 5\/8\" x 1\" actual, built to the exact spec without adjustment. MERV 8 covers standard residential filtration: dust, lint, pollen. MERV 11 handles pet households and mild allergy concerns. MERV 13 captures fine particulates including smoke, bacteria, and virus carriers - the recommended grade for households with asthma or chronic respiratory health issues. Pleated synthetic media with an electrostatic charge built into the fibers handles the filtration work. The pleats provide several times the surface area of a flat fiberglass filter at the same nominal size, which extends the service life to a 60-to-90-day window under typical residential conditions. The electrostatic charge catches sub-micron particles where mechanical filtration alone reaches its physical limits. Manufactured in the USA by Con-Air Industries at the Orlando, Florida facility. Cardboard frame, reinforced to maintain shape under blower suction. Custom-spec filters benefit most from dimensional precision because an off-spec filter leaves a gap where unfiltered air bypasses the media, which defeats the purpose of running any MERV grade above the baseline.","brand":"Aerostar","offers":[{"title":"MERV 8 \/ 6","offer_id":41902397522074,"sku":"P80S.012021K-6","price":130.62,"currency_code":"USD","in_stock":true},{"title":"MERV 11 \/ 2","offer_id":41902397358234,"sku":"P15S.012021K-2","price":44.99,"currency_code":"USD","in_stock":false},{"title":"MERV 13 \/ 2","offer_id":41902397391002,"sku":"P25S.012021K-2","price":46.34,"currency_code":"USD","in_stock":false},{"title":"MERV 8 \/ 4","offer_id":41902397423770,"sku":"P80S.012021K-4","price":89.83,"currency_code":"USD","in_stock":false},{"title":"MERV 11 \/ 4","offer_id":41902397456538,"sku":"P15S.012021K-4","price":85.93,"currency_code":"USD","in_stock":false},{"title":"MERV 13 \/ 4","offer_id":41902397489306,"sku":"P25S.012021K-4","price":87.16,"currency_code":"USD","in_stock":false},{"title":"MERV 8 \/ 2","offer_id":41902397325466,"sku":"P80S.012021K-2","price":45.83,"currency_code":"USD","in_stock":false},{"title":"MERV 11 \/ 6","offer_id":41902397554842,"sku":"P15S.012021K-6","price":124.94,"currency_code":"USD","in_stock":true},{"title":"MERV 13 \/ 6","offer_id":41902397587610,"sku":"P25S.012021K-6","price":127.99,"currency_code":"USD","in_stock":true},{"title":"MERV 8 \/ 12","offer_id":41902397620378,"sku":"P80S.012021K-12","price":247.48,"currency_code":"USD","in_stock":true},{"title":"MERV 11 \/ 12","offer_id":41902397653146,"sku":"P15S.012021K-12","price":236.73,"currency_code":"USD","in_stock":true},{"title":"MERV 13 \/ 12","offer_id":41902397685914,"sku":"P25S.012021K-12","price":235.57,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0591\/6937\/4362\/files\/20x21Kx1_MERV8_6pk_dffaff09-93d4-403a-b01e-9175972f99df.png?v=1788750520","url":"https:\/\/myairfiltersdeliveredeals.com\/products\/20x21-5-8x1-air-filter","provider":"Air Filters Delivered","version":"1.0","type":"link"}