| Rated to have a Restrictive Airflow Impact |
| Detail on Efficiency Ratings for Dryer Exhaust Terminations and Fittings |
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For quick comparison, the airflow efficiency of each fitting on the Dryerbox.com site has been broken down to three
levels. The item you were reviewing is rated as restrictive: extra care should be taken to be certain all run length guidelines are followed. Extra long runs should be avoided.
Ratings Breakdown
 Most Efficient Rating for Exhaust Fittings
Less than .10 Increase in WCI Back Pressure
 Medium Rating for Exhaust Fittings
Between .10 and .30 Increase in WCI Back Pressure
 Restrictive Rating for Exhaust Fittings
More than .30 Increase in Back Pressure
For the actual effect each product has on Water Column Inches of back pressure, you may find details in the matrix below.
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Airflow Efficient Ratings Matrix by Product
| Fitting Type |
Desciption |
Model ID |
Thumbnail |
Buy |
Airflow
Reduction (wci)* |
| Roof |
Roof Jack Plastic |
ROOFJK |
 |
 |
.35 |
| Wall |
4" Louvered Vent |
GH4W |
 |
|
.08 |
| |
No Nest Vent |
NO NEST |
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|
.10 |
| |
3 Louver Opening Vent |
HS4W |
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|
.10 |
| |
Dryer Vent Closure |
DRYER VENT |
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|
.42 |
| Eave |
Under Eave Vent |
EVEVENT |
 |
|
.10 |
| Fittings |
Sectioned 90 Degree Elbow |
ELL-4 |
 |
|
.15 |
| |
Dryer-Ell 10 Inch Radius 90° Elbow |
LT90 |
 |
|
.05 |
| |
Dryer-Ell 10 Inch Radius 45° Elbow |
LT45 |
 |
|
.05 |
| |
Close Ell |
CLOSE-ELL |
 |
|
.25 |
| |
Lint Trap |
ECCO Lint Trap |
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|
.14 |
| Flex |
Foil Wire Bound |
FOIL-45 |
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|
.35 |
| |
Semi Rigid Alum Flex |
ALUM-439 |
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|
.10 |
| |
Semi Rigid Alum Flex |
ALUM-448 |
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|
.10 |
*Difference with and without fitting, measured with a magnehelic gauge.
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