Get 20% off plus enjoy free shipping on your order at Discount Filter Store. Valid for a limited time. Use the coupon code at checkout.

Enjoy 20% off all furnace, humidifier and fridge air filters. Valid for a limited time. Exclusions may apply.

Get 20% off your order of Tier1 Air Filters. Valid for a limited time. No minimum purchase required.

Save 20% on select replacement cartridges. Valid for selected items only

Enjoy a 15% discount on all Tier1 and Tier1 Plus products. Valid for a limited time. Exclusively for Tier1 and Tier1 Plus items.