Get a free Canopy Air Filter, including free shipping! Click the ‘Shop 1” Filters’ button, select your width & height of your desired air filter (leave the depth at 1”), and choose the frequency of receiving a new air filter shipment. Then enter your mailing and payment info, the promo code CANOPY2018 should automatically be applied making your total $0. Note: A credit card is required to checkout with their free trial offer, but you can cancel at any time. Request Sample Now!