Mendota CHELSEA M-27, Installation And Operating Instructions Manual

Page: 36 / 104

85-03-01120 M27 Page 36
Exterior Vent Locations and Restrictions
Note: All measurements are to be taken from the center of the vent cap.

-
Vent Terminal
X -
Air Supply Inlet

-
Area where terminal is not permitted
A
= Clearance above grade, veranda, porch, deck, or
balcony (*18 inches (45 cm) minimum) H
= *Not to be installed above a meter/regulator assembly
within 3 feet (90 cm) horizontally from the center-line
of the regulator; within a height of 15 feet
B
= Clearance to window or door that may be opened
(*18 inches (45 cm) minimum.
I = *Clearance to service regulator vent outlet *3 feet (92
cm) minimum.
C
= *Clearance to permanently closed window
(minimum 18 inches (45 cm) recommended to
prevent condensation on window)
J = *Clearance to non-mechanical air supply inlet to
building or the combustion air inlet to any other
appliance.
12 inches (30 cm) minimum.
D
= *Vertical clearance to ventilated soffit located
above the terminal from the center-line of the
terminal 18
” ( 45 cm) min . Minimum 24” (60 cm to
Vinyl Soffit)
K
= *Clearance to a mechanical air supply inlet
In USA, 3 feet minimum above, if within 10 feet
horizontally. In Canada, 6 feet minimum
E
= *Clearance to unventilated soffit 18 ” min ( 45 cm)
min. Minimum 24” (60 cm to Vinyl Soffit)
L
=
†
Clearance above paved side-walk or a paved
driveway located on public property (*7 feet (2.1 m)
minimum)
F = Clearance to outside corner - 12 inches (30 cm). M
= Clearance under veranda, porch, deck, or balcony (*18
inches (45 cm) minimum
‡
)
G
= Clearance to inside corner - 12 inches (30 cm).
Vinyl surfaces require 24” min (60 cm).
N= Minimum 24” horizontal clearance to any surface,
such as an exterior surface, for vertical terminations.