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Home arrow Resources arrow ASHRAE Glossary
Glossary

 

The terms and definitions included in this glossary were taken from "ASHRAE Terminology of Heating, Ventilation, Air Conditioning & Refrigeration".
To access the complete glossary please visit ASHRAE's Bookstore.


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Term Definition
filter mixing box

in air-handling units, a combination filter section outside air/return air mixing plenum, including control dampers. Compare VAV box 

 
filter pressdevice for removing liquid from a slurry or suspension of solids under pressure with the liquid expressed through screens or other filter media until the desired density of the slurry is attained
 
fin


thin piece of metal attached to a pipe, tubing, or other surface in order to increase the heat transfer area. See also heat transfer surface 

 
fin pitch

number of transverse fins per unit length of tube 

 
fin spacing

distance between two successive transverse fins on a tube.

 

 
finned length

on a finned tube, the distance between the two end fins (excluding lengths for return bends and other overall lengths).

 
finned surface area

total area of fins and prime surface of tube or plate to which fins are attached 

 
fire point

lowest temperature at which a product ignites and continues to burn for a specified time after a small flame has been applied to its surface under standardized conditions. Compare flash point.

 
first-hour rating

amount of hot water that a water heater can supply in an hour of operation.

 
fitting system

part used to join, adjust, or adapt other parts as in a pipe or duct system.  

 




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