🚚Free Shipping On All Orders! Need Help? Call Us
855-740-0855
Skip to content
Factory Direct Filters
Search
Close
Search
Account
0
Cart
.
.
.
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 7 Carbon
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 7 Carbon
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
/
Collections
/
All 4 inch Filters
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
(81)
Out of stock
(90)
Price
4 Inch HVAC & Furnace Filters
.
.
.
.
Filter
134 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
10x10x4 Aerostar Air Filter
from
$168
30
from
$168.30
Regular price
$210
38
$210.38
Save 20%
"Close (esc)"
Add to cart
10x14x4 Aerostar Air Filter
from
$49
38
from
$49.38
Regular price
$61
73
$61.73
Save 20%
"Close (esc)"
Add to cart
10x16x4 Aerostar Air Filter
from
$64
22
from
$64.22
Regular price
$80
28
$80.28
Save 20%
"Close (esc)"
Add to cart
10x18x4 Aerostar Air Filter
from
$135
30
from
$135.30
Regular price
$169
13
$169.13
Save 20%
"Close (esc)"
10x20x4 - Air Filter
from
$1,295
28
from
$1,295.28
"Close (esc)"
Add to cart
10x24x4 Aerostar Air Filter
from
$135
30
from
$135.30
Regular price
$169
13
$169.13
Save 20%
"Close (esc)"
Add to cart
12 1/2x24 1/2x4 Aerostar Air Filter
from
$135
30
from
$135.30
Regular price
$169
13
$169.13
Save 20%
"Close (esc)"
Add to cart
12 1/4x15x4 Aerostar Air Filter
from
$135
30
from
$135.30
Regular price
$169
13
$169.13
Save 20%
"Close (esc)"
12x12x4 - Air Filter
from
$1,295
28
from
$1,295.28
"Close (esc)"
12x16x4 Commercial HVAC Filter
from
$1,295
28
from
$1,295.28
"Close (esc)"
Add to cart
12x18x4 Aerostar Air Filter
from
$63
63
from
$63.63
Regular price
$79
54
$79.54
Save 20%
"Close (esc)"
12x20x4 Commercial HVAC Filter
from
$1,295
28
from
$1,295.28
"Close (esc)"
Add to cart
12x24x4 Commercial & Residential Aerostar Air Filter
from
$30
30
from
$30.30
Regular price
$37
87
$37.87
Save 20%
"Close (esc)"
Add to cart
12x30x4 Aerostar Air Filter
from
$158
46
from
$158.46
Regular price
$198
08
$198.08
Save 20%
"Close (esc)"
Add to cart
12x36x4 Aerostar Air Filter
from
$80
82
from
$80.82
Regular price
$101
03
$101.03
Save 20%
"Close (esc)"
Add to cart
13x21 1/2x4 Aerostar Air Filter
from
$64
22
from
$64.22
Regular price
$80
28
$80.28
Save 20%
"Close (esc)"
14x14x4 - Air Filter
from
$1,176
96
from
$1,176.96
"Close (esc)"
14x16x4 - Air Filter
from
$1,412
58
from
$1,412.58
"Close (esc)"
14x18x4 - Air Filter
from
$1,295
28
from
$1,295.28
"Close (esc)"
14x20x4 Commercial HVAC Filter
from
$1,295
28
from
$1,295.28
"Close (esc)"
Add to cart
14x22x4 Aerostar Air Filter
from
$64
78
from
$64.78
Regular price
$80
97
$80.97
Save 20%
"Close (esc)"
Aerostar 14x24x4 - Furnace Air Filters
from
$1,412
58
from
$1,412.58
"Close (esc)"
14x25x4 Commercial HVAC Filter
from
$1,412
58
from
$1,412.58
"Close (esc)"
14x30x4 - Air Filter
from
$1,412
58
from
$1,412.58
"Close (esc)"
Add to cart
14x36x4 Aerostar Air Filter
from
$240
94
from
$240.94
Regular price
$301
18
$301.18
Save 20%
"Close (esc)"
15x20x4 - Air Filter
from
$1,295
28
from
$1,295.28
"Close (esc)"
15x25x4 Commercial HVAC Filter
from
$1,412
58
from
$1,412.58
"Close (esc)"
Add to cart
15x30x4 Aerostar Air Filter
from
$158
46
from
$158.46
Regular price
$198
08
$198.08
Save 20%
"Close (esc)"
Add to cart
15x36x4 Aerostar Air Filter
from
$175
16
from
$175.16
Regular price
$218
95
$218.95
Save 20%
"Close (esc)"
Add to cart
16 1/2x21 1/2x4 Aerostar Air Filter
from
$51
75
from
$51.75
Regular price
$64
69
$64.69
Save 20%
"Close (esc)"
Add to cart
16 1/2x21 5/8x4 Aerostar Air Filter
from
$185
28
from
$185.28
Regular price
$231
60
$231.60
Save 20%
"Close (esc)"
16 1/4x21 1/2x4 - Air Filter
from
$1,412
58
from
$1,412.58
"Close (esc)"
Add to cart
16 3/8x21 1/2x4 Aerostar Air Filter
from
$141
72
from
$141.72
Regular price
$177
15
$177.15
Save 20%
"Close (esc)"
Add to cart
16x16x4 Aerostar Air Filter
from
$51
13
from
$51.13
Regular price
$63
92
$63.92
Save 20%
"Close (esc)"
16x18x4 - Air Filter
from
$1,412
58
from
$1,412.58
"Close (esc)"
Add to cart
16x20x4 Commercial & Residential Aerostar Air Filter
from
$54
99
from
$54.99
Regular price
$61
99
$61.99
Save 11%
"Close (esc)"
16x21x4 - Air Filter
from
$1,412
58
from
$1,412.58
"Close (esc)"
16x22x4 - Air Filter
from
$1,412
58
from
$1,412.58
"Close (esc)"
Add to cart
16x24x4 Commercial & Residential Aerostar Air Filter
from
$68
60
from
$68.60
Regular price
$85
75
$85.75
Save 20%
"Close (esc)"
Add to cart
16x25x4 Commercial & Residential Aerostar Air Filter by Aerostar
from
$47
97
from
$47.97
Regular price
$48
99
$48.99
Save 2%
"Close (esc)"
View More
Recently viewed
"Close (esc)"
"Close (esc)"
