Equivalent Length Of Fittings; Clearances; Sidewall Installations - Patterson-Kelley DVSCM-02 Owner's Manual

®
Thermific Gas-Fired Boiler
Whichever termination is chosen, it must be double
wall vent certified under UL 1738, or ULC-636.
When installing a sidewall exhaust system the
termination must be backed by a metal plate secured to
the wall as shown in the figure.
Correct rain cap,
unrestricted.
If the exhaust vent is routed through the roof, the
termination must be either the same type as described
for a sidewall installation or a rain cap. The preferred
method to terminate the exhaust vent is with a rain cap
to minimize the drippage of condensate onto the roof
and ice build-up. The rain cap should be an
Typical incorrect
rain cap.
Flue Gas
Outlet
unrestrictive type similar to the figure above. Elbows
are also acceptable.

3.4.5 Equivalent Length of Fittings

Fitting Description
90º Elbow
45º Elbow
Rain Cap
Boot Tee/135º Tee
Standard Tee Used as a
Vent Termination
3.4 C
LEARANCES
In addition to any clearance requirements in Sections
3.1 and 3.3 the following clearances must be
maintained for inlet and vent components.

3.4.1 Sidewall Installations

Page 7
Equivalent Length
10 feet
5 feet
10 feet
10 feet
10 feet
Flue Gas
Outlet
Combustion
Air Intake
2' to snow
line
Installation