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18x20x1 Air Filter
Efficiency	APR 2250	APR 2250	APR 1950	APR 1950	APR 1550	APR 1550	APR 650	APR 650	Carbon	Carbon
Equivalent	N/A	N/A	Merv 13	Merv 13	Merv 11	Merv 11	Merv 8	Merv 8	N/A	N/A
Performance	Best	Best	Best	Best	Better	Better	Good	Good	N/A	N/A
Actual Size	17.5x19.5x1	Actual Size	17.5x19.5x1	Actual Size	17.75x19.75x1	Actual Size	17.75x19.75x1	Actual Size	17.5x19.5x1	Actual Size
Brand	Accumulair	Accumulair	Accumulair	Accumulair	Accumulair	Accumulair	Accumulair	Accumulair	Accumulair	Accumulair
Item #	FI18X20	FI18X20A	FD18X20	FD18X20A	FA18X20	FA18X20A	FB18X20	FB18X20A	FO18X20X1	FO18X20X1A
Purchase	$23.75 Min Qty: 2 Order Options	$23.75 Min Qty: 2 Order Options	$21.11 Min Qty: 2 Order Options	$21.11 Min Qty: 2 Order Options	$17.15 Min Qty: 2 Order Options	$17.15 Min Qty: 2 Order Options	$11.87 Min Qty: 2 Order Options	$11.87 Min Qty: 2 Order Options	$18.47 Min Qty: 2 Order Options	$19.79 Min Qty: 2 Order Options
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18x20x1

Air Filter

Efficiency: APR 2250

Equivalent: N/A

Performance: Best

Actual Size: 17.5x19.5x1

Brand: Accumulair

Item # FI18X20

$23.75

Min Qty: 2

Order Options

Efficiency: APR 2250

Equivalent: N/A

Performance: Best

Actual Size: Actual Size

Brand: Accumulair

Item # FI18X20A

$23.75

Min Qty: 2

Order Options

Efficiency: APR 1950

Equivalent: Merv 13

Performance: Best

Actual Size: 17.5x19.5x1

Brand: Accumulair

Item # FD18X20

$21.11

Min Qty: 2

Order Options

Efficiency: APR 1950

Equivalent: Merv 13

Performance: Best

Actual Size: Actual Size

Brand: Accumulair

Item # FD18X20A

$21.11

Min Qty: 2

Order Options

Efficiency: APR 1550

Equivalent: Merv 11

Performance: Better

Actual Size: 17.75x19.75x1

Brand: Accumulair

Item # FA18X20

$17.15

Min Qty: 2

Order Options

Efficiency: APR 1550

Equivalent: Merv 11

Performance: Better

Actual Size: Actual Size

Brand: Accumulair

Item # FA18X20A

$17.15

Min Qty: 2

Order Options

Efficiency: APR 650

Equivalent: Merv 8

Performance: Good

Actual Size: 17.75x19.75x1

Brand: Accumulair

Item # FB18X20

$11.87

Min Qty: 2

Order Options

Efficiency: APR 650

Equivalent: Merv 8

Performance: Good

Actual Size: Actual Size

Brand: Accumulair

Item # FB18X20A

$11.87

Min Qty: 2

Order Options

Efficiency: Carbon

Equivalent: N/A

Performance: N/A

Actual Size: 17.5x19.5x1

Brand: Accumulair

Item # FO18X20X1

$18.47

Min Qty: 2

Order Options

Efficiency: Carbon

Equivalent: N/A

Performance: N/A

Actual Size: Actual Size

Brand: Accumulair

Item # FO18X20X1A

$19.79

Min Qty: 2

Order Options

The manufacturer has discontinued the MERV 6 / APR 450 filters from their line up, our suggested replacement is the MERV 8 / APR 650 Gold filter, you may see the Emerald MERV 6 / APR 450 still on the website, we are actively removing that MERV/APR

** The typical ship time for orders is now around 15 to 20 business days **

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18x20x1

Air Filter

Efficiency

APR 2250

APR 2250

APR 1950

APR 1950

APR 1550

APR 1550

APR 650

APR 650

Carbon

Carbon

Equivalent

N/A

N/A

Merv 13

Merv 13

Merv 11

Merv 11

Merv 8

Merv 8

N/A

N/A

Performance

Best

Best

Best

Best

Better

Better

Good

Good

N/A

N/A

Actual Size

17.5x19.5x1

Actual Size

17.5x19.5x1

Actual Size

17.75x19.75x1

Actual Size

17.75x19.75x1

Actual Size

17.5x19.5x1

Actual Size

Brand

Accumulair

Accumulair

Accumulair

Accumulair

Accumulair

Accumulair

Accumulair

Accumulair

Accumulair

Accumulair

Item #

FI18X20

FI18X20A

FD18X20

FD18X20A

FA18X20

FA18X20A

FB18X20

FB18X20A

FO18X20X1

FO18X20X1A

Purchase

$23.75

Min Qty: 2

$23.75

Min Qty: 2

$21.11

Min Qty: 2

$21.11

Min Qty: 2

$17.15

Min Qty: 2