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Shop by Size
1 Inch Filters
2 & 3 Inch Filters
4 Inch Filters
5 & 6 Inch Filters
Shop by MERV
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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
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Expand submenu
Air Purifier Filters
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Coway
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All 4 inch Filters
50 products
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Featured
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Price, high to low
Date, old to new
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(65)
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(77)
Price
4 Inch HVAC & Furnace Filters
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108 products
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Best selling
Alphabetically, A-Z
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Price, low to high
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Date, old to new
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10x10x4 - Air Filter
from
$168
30
from
$168.30
Regular price
$210
38
$210.38
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10x14x4 - Air Filter
from
$135
30
from
$135.30
Regular price
$169
13
$169.13
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10x16x4 - Air Filter
from
$135
30
from
$135.30
Regular price
$169
13
$169.13
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10x18x4 - Air Filter
from
$135
30
from
$135.30
Regular price
$169
13
$169.13
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10x20x4 - Air Filter
from
$1,295
28
from
$1,295.28
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10x24x4 - Air Filter
from
$135
30
from
$135.30
Regular price
$169
13
$169.13
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Add to cart
12 1/2x24 1/2x4 - Air Filter
from
$135
30
from
$135.30
Regular price
$169
13
$169.13
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Add to cart
12 1/4x15x4 - Air Filter
from
$135
30
from
$135.30
Regular price
$169
13
$169.13
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12x12x4 - Air Filter
from
$1,295
28
from
$1,295.28
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12x16x4 Commercial HVAC Filter
from
$1,295
28
from
$1,295.28
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12x18x4 - Air Filter
from
$168
30
from
$168.30
Regular price
$210
38
$210.38
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12x20x4 Commercial HVAC Filter
from
$1,295
28
from
$1,295.28
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12x24x4 Commercial HVAC Air Filter
from
$54
99
from
$54.99
Regular price
$69
80
$69.80
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12x30x4 - Air Filter
from
$158
46
from
$158.46
Regular price
$198
08
$198.08
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12x36x4 - Air Filter
from
$200
12
from
$200.12
Regular price
$250
15
$250.15
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Add to cart
13x21 1/2x4 - Air Filter
from
$135
30
from
$135.30
Regular price
$169
13
$169.13
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14x14x4 - Air Filter
from
$1,176
96
from
$1,176.96
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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
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Add to cart
14x22x4 - Air Filter
from
$185
28
from
$185.28
Regular price
$231
60
$231.60
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Aerostar 14x24x4 - Furnace Air Filters
from
$1,412
58
from
$1,412.58
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14x25x4 Commercial HVAC Filter
from
$1,412
58
from
$1,412.58
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14x30x4 - Air Filter
from
$1,412
58
from
$1,412.58
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Add to cart
14x36x4 - Air Filter
from
$240
94
from
$240.94
Regular price
$301
18
$301.18
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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 - Air Filter
from
$158
46
from
$158.46
Regular price
$198
08
$198.08
"Close (esc)"
Add to cart
15x36x4 - Air Filter
from
$175
16
from
$175.16
Regular price
$218
95
$218.95
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Add to cart
16 1/2x21 1/2x4 - Air Filter
from
$141
72
from
$141.72
Regular price
$177
15
$177.15
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Add to cart
16 1/2x21 5/8x4 - Air Filter
from
$185
28
from
$185.28
Regular price
$231
60
$231.60
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16 1/4x21 1/2x4 - Air Filter
from
$1,412
58
from
$1,412.58
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Add to cart
16 3/8x21 1/2x4 - Air Filter
from
$141
72
from
$141.72
Regular price
$177
15
$177.15
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Add to cart
16x16x4 - Air Filter
from
$138
94
from
$138.94
Regular price
$173
68
$173.68
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16x18x4 - Air Filter
from
$1,412
58
from
$1,412.58
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16x20x4 - White Rogers Deep Pleat Air Filter
White Rodgers
from
$54
48
from
$54.48
Regular price
$68
10
$68.10
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16x20x4 Commercial HVAC Air Filter
Aerostar
from
$53
48
from
$53.48
Regular price
$66
85
$66.85
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16x20x4 Whole House Air Filter for White Rogers FR1000M-108
White Rodgers
from
$60
30
from
$60.30
Regular price
$75
38
$75.38
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16x21x4 - Air Filter
from
$1,412
58
from
$1,412.58
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16x22x4 - Air Filter
from
$1,412
58
from
$1,412.58
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