Shop

“Filterbuy 18x18x4 Air Filter MERV 13 Optimal Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.50 x 17.50 x 3.63 Inches)” has been added to your cart. View cart

-41%

Add to cart

Filterbuy 18x18x4 Air Filter MERV 13 Optimal Defense (12-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.50 x 17.50 x 3.63 Inches)

Original price was: $340.92.Current price is: $200.00.
-40%

Add to cart

Filterbuy 18x18x4 Air Filter MERV 13 Optimal Defense (3-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.50 x 17.50 x 3.63 Inches)

Original price was: $99.39.Current price is: $59.63.
-51%

Add to cart

Filterbuy 18x18x4 Air Filter MERV 13 Optimal Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.50 x 17.50 x 3.63 Inches)

Original price was: $129.52.Current price is: $63.27.
-45%

Add to cart

Filterbuy 18x18x4 Air Filter MERV 13 Optimal Defense (5-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.50 x 17.50 x 3.63 Inches)

Original price was: $155.15.Current price is: $85.11.
-54%

Add to cart

Filterbuy 18x18x4 Air Filter MERV 13 Optimal Defense (6-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.50 x 17.50 x 3.63 Inches)

Original price was: $178.14.Current price is: $82.58.
-40%

Add to cart

Filterbuy 18x18x4 Air Filter MERV 8 (MPR 700) Dust Defense Replacement (3-Pack), Electrostatic Pleated HVAC AC Furnace Filters, Made in USA (Actual Size: 17.50 x 17.50 x 3.63)

Original price was: $76.83.Current price is: $46.10.
-40%

Add to cart

Filterbuy 18x18x4 Air Filter MERV 8 (MPR 700) Dust Defense Replacement (4-Pack), Electrostatic Pleated HVAC AC Furnace Filters, Made in USA (Actual Size: 17.50 x 17.50 x 3.63)

Original price was: $99.40.Current price is: $59.64.
-54%

Add to cart

Filterbuy 18x18x4 Air Filter MERV 8 (MPR 700) Dust Defense Replacement (6-Pack), Electrostatic Pleated HVAC AC Furnace Filters, Made in USA (Actual Size: 17.50 x 17.50 x 3.63)

Original price was: $135.60.Current price is: $62.39.
-40%

Add to cart

Filterbuy 18x18x4 Air Filter MERV 8 Dust Defense (1-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.50 x 17.50 x 3.63 Inches)

Original price was: $43.40.Current price is: $26.04.
-46%

Add to cart

Filterbuy 18x18x4 Air Filter MERV 8 Dust Defense (5-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.50 x 17.50 x 3.63 Inches)

Original price was: $118.55.Current price is: $63.60.
-40%

Add to cart

Filterbuy 18x20x4 Air Filter MERV 11 (MPR 1200) Allergen Defense Replacement (1-Pack), Electrostatic Pleated HVAC AC Furnace Filters, Made in USA (Actual Size: 17.50 x 19.50 x 3.63)

Original price was: $46.00.Current price is: $27.60.
-40%

Add to cart

Filterbuy 18x20x4 Air Filter MERV 11 (MPR 1200) Allergen Defense Replacement (2-Pack), Electrostatic Pleated HVAC AC Furnace Filters, Made in USA (Actual Size: 17.50 x 19.50 x 3.63)

Original price was: $57.50.Current price is: $34.50.

Filterbuy 18x18x4 Air Filter MERV 13 Optimal Defense (12-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.50 x 17.50 x 3.63 Inches)

Filterbuy 18x18x4 Air Filter MERV 13 Optimal Defense (3-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.50 x 17.50 x 3.63 Inches)

Filterbuy 18x18x4 Air Filter MERV 13 Optimal Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.50 x 17.50 x 3.63 Inches)

Filterbuy 18x18x4 Air Filter MERV 13 Optimal Defense (5-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.50 x 17.50 x 3.63 Inches)

Filterbuy 18x18x4 Air Filter MERV 13 Optimal Defense (6-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.50 x 17.50 x 3.63 Inches)

Filterbuy 18x18x4 Air Filter MERV 8 (MPR 700) Dust Defense Replacement (3-Pack), Electrostatic Pleated HVAC AC Furnace Filters, Made in USA (Actual Size: 17.50 x 17.50 x 3.63)

Filterbuy 18x18x4 Air Filter MERV 8 (MPR 700) Dust Defense Replacement (4-Pack), Electrostatic Pleated HVAC AC Furnace Filters, Made in USA (Actual Size: 17.50 x 17.50 x 3.63)

Filterbuy 18x18x4 Air Filter MERV 8 (MPR 700) Dust Defense Replacement (6-Pack), Electrostatic Pleated HVAC AC Furnace Filters, Made in USA (Actual Size: 17.50 x 17.50 x 3.63)

Filterbuy 18x18x4 Air Filter MERV 8 Dust Defense (1-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.50 x 17.50 x 3.63 Inches)

Filterbuy 18x18x4 Air Filter MERV 8 Dust Defense (5-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.50 x 17.50 x 3.63 Inches)

Filterbuy 18x20x4 Air Filter MERV 11 (MPR 1200) Allergen Defense Replacement (1-Pack), Electrostatic Pleated HVAC AC Furnace Filters, Made in USA (Actual Size: 17.50 x 19.50 x 3.63)

Filterbuy 18x20x4 Air Filter MERV 11 (MPR 1200) Allergen Defense Replacement (2-Pack), Electrostatic Pleated HVAC AC Furnace Filters, Made in USA (Actual Size: 17.50 x 19.50 x 3.63)

Categories

Filter By

Product Tags

Shopping cart