| Rated to have a Medium 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 medium airflow efficiency: it is safe and should work fine as long as other run length guidelines are followed.
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.
A Magnehelic Gauge (as shown to the right) was used to measure the difference with and without the fitting.
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Airflow Efficient Ratings Matrix by Product
| Fitting Type |
Desciption |
Model ID |
Thumbnail |
Buy |
Airflow
Reduction (wci)* |
| Roof |
Dryer Roof Vent Hood |
DRYJK4 |
 |
 |
.20 |
| |
Roof Jack Plastic |
ROOFJK |
 |
|
.51 |
| |
Popular Broan Style |
Not Carried |
 |
N/A |
.40 |
| |
Typical 4" Wide Goose-neck |
Not Carried |
 |
N/A |
.70 |
| |
New Mushroom Style |
Not Carried |
 |
N/A |
.25 |
| Wall |
4" Louvered Vent |
GH4W |
 |
|
.08 |
| |
No Nest Vent |
NO NEST |
 |
|
.01 |
| |
3 Louver Opening Vent |
HS4W |
 |
|
.03 |
| |
Dryer Vent Closure |
DRYER VENT |
 |
|
.60 |
| |
Standard 30° Wall Flapper |
Not Carried |
 |
N/A |
.20 |
| 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 |
 |
|
.15 |
| |
Periscope Style Connector |
Not Carried |
 |
N/A |
.50 |
| Flex |
Foil Wire Bound |
FOIL-45 |
 |
|
.35 |
| |
Semi Rigid Alum Flex |
ALUM-439 |
 |
|
.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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