HTP 399M - Manual (Page 15)

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C. CLEARANCES FOR SERVICE ACCESS
See Figure 4 for recommended service clearances. If you
do not provide the minimum clearances shown, it may not
be possible to service the boiler without removing it from
the space.
D. RESIDENTIAL GARAGE, CLOSET, AND
ALCOVE INSTALLATIONS
Check with your local Authority Having Jurisdiction for
requirements when installing boiler in a garage, closet, or
alcove. Please read the entire manual before attempting
installation. Failure to properly take factors such as boiler
venting, piping, condensate removal, and wiring into
account before installation could result in wasted time,
money, and possible property damage and personal
injury.
PRECAUTIONS
If the boiler is located in a residential garage, per ANSI
Z223.1:
 Mount the bottom of the boiler a minimum of 18”
above the floor of the garage, to ensure the
burner and ignition devices are well off the floor.

Locate or protect the boiler so it cannot be
damaged by a moving vehicle.
Figure 4 – Required Clearances
For closet or alcove installations, a two pipe venting system must be used. Failure to follow this warning could result in substantial
property damage, severe personal injury, or death.
The space must be provided with correctly sized combustion/ventilation air openings for all other appliances located in the space with
the boiler. Do not install the boiler in an attic. Failure to comply with these warnings could result in substantial property damage, severe
personal injury, or death.
NOTE: For installations using room air for combustion, refer to the boiler venting section, Part 6 in this manual.
E. EXHAUST VENT AND INTAKE PIPE
Vents must be properly supported. Boiler exhaust and intake connections are not designed to carry heavy weight. Vent support
brackets must be within 1’ of the boiler and the balance at 4’ intervals. Boiler must be readily accessible for visual inspection for the first
3’ from the boiler.
Space must be provided with combustion/ventilation air
openings correctly sized for all other appliances located in
the same space as the boiler. The boiler cover must be
securely fastened to prevent the boiler from drawing air
form the boiler room. This is particularly important if the
boiler is in a room with other appliances. Failure to comply
with the above warnings could result in substantial
property damage, severe personal injury, or death.