12% OFF ALL ORDERS OVER $65
+ FREE SHIPPING
PROMO CODE:
MLK25
COPY CODE
Skip to content
Factory Direct Filters
Search
Close
Free Shipping
On All Orders!
Search
Account
0
Cart
+1 (855) 740-0855
.
.
.
Site navigation
Close
Search
Close
Cancel
Air Filters
Shop by Size
1 Inch Filters
2 & 3 Inch Filters
4 Inch Filters
5 & 6 Inch Filters
Shop by MERV
MERV 6
MERV 8
MERV 11
MERV 11 + Carbon Defense
MERV 13
Shop by Brand
AeroStar
Air Bear
AprilAire
Carrier
Coway
Honeywell
Lennox
Trane
Winix
Furnace Filters
Specialty Filters
Industrial Filters
Data Center & Router Filters
Paint Booth Filters
Poultry Box Pads
Air Purifier Filters
Coway
Holmes
Winix
Levoit
Humidifier Filters
Custom Air Filters
Subscribe & Save
Reviews
Rewards Program
Wholesale
Search
Close
Your cart is currently empty.
Air Filters
Expand submenu
Air Filters
Shop by Size
Expand submenu
Shop by Size
1 Inch Filters
2 & 3 Inch Filters
4 Inch Filters
5 & 6 Inch Filters
Shop by MERV
Expand submenu
Shop by MERV
MERV 6
MERV 8
MERV 11
MERV 11 + Carbon Defense
MERV 13
Shop by Brand
Expand submenu
Shop by Brand
AeroStar
Air Bear
AprilAire
Carrier
Coway
Honeywell
Lennox
Trane
Winix
Furnace Filters
Specialty Filters
Expand submenu
Specialty Filters
Industrial Filters
Expand submenu
Industrial Filters
Data Center & Router Filters
Paint Booth Filters
Poultry Box Pads
Air Purifier Filters
Expand submenu
Air Purifier Filters
View all
Coway
Holmes
Winix
Levoit
Humidifier Filters
Custom Air Filters
Subscribe & Save
Reviews
Rewards Program
Wholesale
Home
/
All 4 inch Filters
50 products
Sort
Featured
Best selling
Alphabetically, A-Z
Alphabetically, Z-A
Price, low to high
Price, high to low
Date, old to new
Date, new to old
Availability
In stock
(46)
Out of stock
(77)
Price
.
.
.
.
Filter
89 products
Sort
Sort
Featured
Best selling
Alphabetically, A-Z
Alphabetically, Z-A
Price, low to high
Price, high to low
Date, old to new
Date, new to old
Add to cart
16x24x4 Commercial HVAC Air Filter
from
$135
36
from
$135.36
"Close (esc)"
Add to cart
16x25x4 Commercial HVAC Air Filter
from
$91
02
from
$91.02
Regular price
$156
18
$156.18
Save $65.16
"Close (esc)"
16x30x4 - Air Filter
from
$1,882
74
from
$1,882.74
"Close (esc)"
Add to cart
16x32x4 - Air Filter
from
$588
30
from
$588.30
"Close (esc)"
Add to cart
16x36x4 - Air Filter
from
$470
70
from
$470.70
"Close (esc)"
Add to cart
17x22x4 - Air Filter
from
$382
80
from
$382.80
"Close (esc)"
18x18x4 - Air Filter
from
$1,530
90
from
$1,530.90
"Close (esc)"
18x20x4 Commercial HVAC Filter
from
$1,530
90
from
$1,530.90
"Close (esc)"
18x22x4 - Air Filter
from
$1,530
90
from
$1,530.90
"Close (esc)"
Add to cart
18x24x4 Commercial HVAC Air Filter
from
$144
78
from
$144.78
"Close (esc)"
18x25x4 - Air Filter
from
$1,530
90
from
$1,530.90
"Close (esc)"
18x30x4 - Air Filter
from
$1,647
12
from
$1,647.12
"Close (esc)"
Add to cart
18x36x4 - Air Filter
from
$559
20
from
$559.20
"Close (esc)"
19 7/8x21 1/2x4 - Air Filter
from
$1,588
50
from
$1,588.50
"Close (esc)"
Add to cart
20x20x4 Commercial HVAC Air Filter
from
$112
20
from
$112.20
Regular price
$167
40
$167.40
Save $55.20
"Close (esc)"
Add to cart
20x21 1/2x4 - Air Filter
from
$588
30
from
$588.30
"Close (esc)"
20x21x4 - Air Filter
from
$1,530
90
from
$1,530.90
"Close (esc)"
20x22 1/4x4 - Air Filter
from
$1,530
90
from
$1,530.90
"Close (esc)"
20x22x4 - Air Filter
from
$1,530
90
from
$1,530.90
"Close (esc)"
20x23x4 Commercial HVAC Filter
from
$1,530
90
from
$1,530.90
"Close (esc)"
Add to cart
20x24x4 Commercial HVAC Air Filter
from
$108
96
from
$108.96
"Close (esc)"
Add to cart
20x25x4 Commercial HVAC Air Filter
from
$91
44
from
$91.44
Regular price
$140
64
$140.64
Save $49.20
"Close (esc)"
20x30x4 Commercial HVAC Filter
from
$1,530
90
from
$1,530.90
"Close (esc)"
20x32x4 - Air Filter
from
$2,236
56
from
$2,236.56
"Close (esc)"
Add to cart
20x34x4 - Air Filter
from
$559
20
from
$559.20
"Close (esc)"
20x36x4 - Air Filter
from
$686
52
from
$686.52
"Close (esc)"
Add to cart
21 1/2x21 1/2x4 - Air Filter
from
$397
14
from
$397.14
"Close (esc)"
Add to cart
21 1/2x23 1/2x4 - Air Filter
from
$397
14
from
$397.14
"Close (esc)"
Add to cart
21 1/2x23 3/8x4 - Air Filter
from
$490
56
from
$490.56
"Close (esc)"
Add to cart
21 1/2x23 5/16x4 - Air Filter
from
$397
14
from
$397.14
"Close (esc)"
Add to cart
21 1/4x21 1/4x4 - Air Filter
from
$397
14
from
$397.14
"Close (esc)"
Add to cart
21 1/4x23 1/4x4 - Air Filter
from
$522
90
from
$522.90
"Close (esc)"
21x21x4 Commercial HVAC Filter
from
$1,588
50
from
$1,588.50
"Close (esc)"
21x23x4 - Air Filter
from
$1,588
50
from
$1,588.50
"Close (esc)"
22x22x4 - Air Filter
from
$1,588
50
from
$1,588.50
"Close (esc)"
22x24x4 - Air Filter
from
$1,588
50
from
$1,588.50
"Close (esc)"
22x26x4 - Air Filter
from
$621
18
from
$621.18
"Close (esc)"
22x28x4 - Air Filter
from
$1,588
50
from
$1,588.50
"Close (esc)"
Add to cart
22x36x4 - Air Filter
from
$470
70
from
$470.70
"Close (esc)"
Add to cart
24x24x4 Commercial HVAC Air Filter
from
$112
56
from
$112.56
Regular price
$159
84
$159.84
Save $47.28
"Close (esc)"
View More
Recently viewed
"Close (esc)"
"Close (esc)"