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Dryer Terimination and Fittings Airflow Efficiency
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Rated to have a Restrictive Airflow Impact
Detail on Efficiency Ratings for Dryer Exhaust Terminations and Fittings
Airflow Efficient Space for Efficiency Detail
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
Airflow Efficient FittingMost Efficient Rating for Exhaust Fittings
Less than .10 Increase in WCI Back Pressure

Medium Airflow EfficiencyMedium Rating for Exhaust Fittings
Between .10 and .30 Increase in WCI Back Pressure

Restrictive Airflow EfficiencyRestrictive 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.

Airflow Efficient Ratings Matrix by Product

Fitting Type Desciption Model ID Buy Airflow Reduction (wci)*
Roof Roof Jack Plastic ROOFJK Click for Item Detail and Purchase .35
Wall 4" Louvered Vent GH4W Click for Item Detail and Purchase .08
  No Nest Vent NO NEST Click for Item Detail and Purchase .10
  3 Louver Opening Vent HS4W Click for Item Detail and Purchase .10
  Dryer Vent Closure DRYER VENT CLOSURE Click for Item Detail and Purchase .42
Eave Under Eave Vent EVEVENT Click for Item Detail and Purchase .10
Fittings Sectioned 90 Degree Elbow ELL-4 Click for Item Detail and Purchase .15
  Dryer-Ell 10 Inch Radius 90 Degree Elbow LT90 Click for Item Detail and Purchase .05
  Dryer-Ell 10 Inch Radius 45 Degree Elbow LT45 Click for Item Detail and Purchase .05
  Close Ell CLOSE-ELL Click for Item Detail and Purchase .25
  Lint Trap ECCO Lint Trap Click for Item Detail and Purchase .14
Flex Foil Wire Bound FOIL-45 Click for Item Detail and Purchase .35
  Semi Rigid Alum Flex ALUM-439 & 448 Click for Item Detail and Purchase .10
*Difference with and without fitting, measured with a magnehelic gauge.
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