Ventilation
! WARNING
Improper ventilaton may result in
Eproperty damamge, health problems,
Ncarbon monoxide poisoning, injury or
Gdeath.
L
I It is required that the upper levels of the space to be S heated are properly ventilated to supply combustion H air to the heaters and to sufficiently dilute the products
of combustion. It is also required that the flue discharge area is kept clear of gas piping and electrical wiring (see Figure 2.6).
This infra-red heater must be vented in accordance with national, state, provincial and local codes and the guidelines in this manual. In the United Sates refer to the latest edition of ANSI Z223.1 (NFPA 54) and in Canada refer to the latest edition of the CAN/CGA B149.2 Standard.
Provisions must also be made to provide sufficient fresh air intake area and exhaust air outlet area. For proper ventilation, a positive air displacement of 4.0 CFM per 1000 BTU/H of natural gas consumed must be provided. If propane is used, a positive air displacement of 4.5 CFM per 1000 BTU/H of propane gas consumed must be provided.
Where insufficient air movement exists, induced air displacement is required. A balanced system is essential to avoid negative building pressure which causes excessive infiltration, unfavorable drafts and affects combustion efficiency.
Air displacement may be accomplished by either gravity or mechanical means. Mechanical exhausters are preferred and typically mounted at high points on the roof where stagnant air accumulates inside the building. For a flat roof, considerations of prevailing winds, high and low pressure areas, and distribution of air movement must be taken into consideration when locating exhausters.
Dayton® High Intensity Heaters
Dayton Installation, Operation, Maintenance and Parts Manual
3E132 thru 3E134, 3E460 thru 3E462, 5VD57 thru 5VD66, 3VH34 thru 3VH37
! CAUTION
Ventilate enclosed spaces and buildings according to national, state, provincial and local codes. Failure to provide adequate ventilation may result in
equipment malfunctions, condensation and other air quality issues.
Figure 2.6 Hot Flue Discharge
Flue discharge | Manifold/ |
Control End |
Important! Do not | Down |
install gas piping or | |
electrical wiring | |
above the flue | |
discharge area! | |
20˚ - 35˚
SIDE VIEW
Best air distribution is accomplished by using a number of small exhausters versus one large exhauster. Provide a minimum of one square inch of inlet area per 1000 BTU/H for combustion air supply. Inlet opening in the building should be well distributed (see Figure 2.1) high in the sidewalls and should direct incoming air upward to dilute products of combustion while preventing drafts at lower levels. Inlets are typically 1 to 3 sq. ft.
Local codes may require that mechanical exhaust systems be interlocked with heaters to enable both to function simultaneously (see page 17, Figure 2.7) or allow control of exhausters with a ceiling mounted humidistat.
