TM 9-4520-257-12&P 0005 00
Assembling The Stack For H-45 Type II (Liquid Fuel) Heater Operation
Ensure the stack pipe sections seat together securely. Poorly fitted
stack sections may allow a hot stack to fall on the tent and start a fire or
allow deadly carbon monoxide to leak into the tent.
It is important to stake the exhaust stack securely since this will keep the
exhaust stack vertical and seated firmly within the stack adapter with a
downward force. This also stabilizes the heater and helps prevent it from
being knocked over if bumped by equipment or people inside the tent.
The tent needs to be securely staked to prevent the tent roof and walls
from flapping during snowy and windy conditions. If the tent itself is not
tightly staked, the roof and sidewalls can flap, getting close to the heater
and creating a fire danger. (Refer to the tent-specific operator manual on
the proper staking of the tent.)
During operation, the H-45 heater produces harmful carbon monoxide
and other gases. Carbon monoxide is a colorless, odorless, and
tasteless gas. Remember that although carbon monoxide has no telltale
odor, it may mix with other odors that mask its presence; therefore,
carbon monoxide can be present within a mix of seemingly harmless
odors. Mild cases of carbon monoxide poisoning can cause symptoms
such as nausea, dizziness, or headaches. Severe cases of carbon
monoxide poisoning can result in brain damage, heart damage, or death.
To prevent carbon monoxide poisoning, ensure that the H-45 heater
exhaust stack sections fit together snugly and that the exhaust gases are
properly vented through the roof of the tent. Keep the H-45 heater in
good working order. Ensure that all possible sources of carbon
monoxide leakage have been repaired and that the operating space is
All six stack pipe sections and stack cap assembly must be assembled,
put securely in place on the top heater shell flange, and tied down during
heater operation. Failure to use all six sections will adversely affect
heater performance, increase soot buildup, and increase maintenance.
The type of tent, use of a step aid (if available), and height and strength
of the persons assembling the stack may alter the following stack