Oval
pipe and fittings are primarily used for
air distribution runs in interior walls to convey conditioned air
to upper stories. The slim profile allows for use in
standard stud wall cavities and in joist spaces between floors.
The nominal size of oval has a cross sectioned area that is less
than that of the corresponding size of pipe. Review both of
these charts to make sure of correct sizing. Typical
application; round takeoff to round pipe from duct. The
round pipe makes a transition to oval by using a 859. Oval
pipe is attached to the other side of the 859 and continues up
between the stud spaces in an interior wall to the second floor.
OVAL SIZE/CAPACITY COMPARISON
SIZE OVAL
ROUND
WALLSTACK 5".......17.2 Sq.
In......19.6........26.0 (3 1/4 X 8) 6".......22.2 Sq.
In......28.3......32..5 (3 1/4 X 10) 7".......27.2 Sq.
In......38.5.......39.0 (3 1/4 X 12)
