Reduced Clearances - Newmac NS220E Installation, Operating And Service Manual

REDUCED CLEARANCES

Approved double-wall chimney connector and/or approved non-combustible protection over combustible surfaces may
permit the heater to be installed closer to combustible surfaces than the standard clearances to combustibles.
Clearances may only be reduced by means approved by the regulatory authority. To reduce clearances to combustible
materials, specified forms of wall protection must be installed. For acceptable methods and parts to be used, refer to
NFPA 211 (USA) or CAN/CSA B365 (Canada). Since municipal bylaws vary it is recommended that you (the installer)
check with your local authorities as to approved methods of wall protection for reduced clearances.
Ceiling
Non-combustible
wall protection
20 in min
500mm
Heater
Floor
Side view
TYPICAL SIDE-WALL PROTECTION FOR CLEARANCE REDUCTION OF 50%
3 in min
75mm
Non-combustible
support spacers
Wall
air space for free
vertical air movement
1 to 3 ins
25 to 75 mm
7/8in min
21mm
Non-combustible
wall protection
Non-combustible
support spacers
at least 8" (200mm)
from center line
Heater
vertical air movement
Reduced clearance
Wall
Top view
7/8in min
21mm
4
Wall protection
screw
air space for free
Typical non-combustible
spacer detail
Vertical steel
channel standoff
Combustible wall