Boiler Room Design; Boiler Room Air Supply Requirements - Slant/Fin Caravan LDWO-1100-3-6 Application Manual

BOILER ROOM DESIGN

Caravan modular boiler systems allow better utilization of floor
space and permit future expansion with minimum cost.
Caravan modules are hand truckable, fit through doorways
and often may be installed around an existing inoperative
boiler. They can be grouped in heating module batteries of
single, multiple or angular rows. Oil-fired boiler systems
consisting of 9 or more modules should be piped in parallel in
two or more batteries. Illustrated below are typical boiler room
layouts and dimensional data on the size requirements of oil-
fired hot water boilers.
Figure 7. Correct location of combustion-air supply ducts
BOILER ROOM AIR SUPPLY
To ensure safe, efficient operation, the modular boiler system
must be supplied with sufficient air to support complete
combustion, replacing air entering draft dampers or draft
hoods and ventilating the boiler room or areas.
For additional information, not listed below, see ANSI, Z223.1,
section 5.3.3.
INSTALLATION IN ENCLOSED BOILER ROOM REQUIRES
TWO UNOBSTRUCTED OPENINGS FOR PASSAGE OF
AIR INTO THE BOILER ROOM:
1. Air drawn horizontally from outdoors DIRECTLY
through an outside wall; one louvered opening near the
floor (below burner inlet) and one louvered opening near
the ceiling (above the highest draft regulator), each
opening with a minimum FREE air passage area of 1
square inch per 4000 BTUH of total system input.
2. Air drawn horizontally from outdoors through
HORIZONTAL DUCTS; one opening near the floor
(below burner inlet) and one opening near the ceiling
(above the highest draft regulator), each opening with a
minimum FREE air passage area of 1 square inch per
2000 BTUH of total system input.
3. Air drawn VERTICALLY from outdoors; one opening at
the floor and one opening at the ceiling, each opening
with a minimum FREE air passage area of 1 square
inch per 4000 BTUH of total system input.
4. Air drawn from inside the building; one opening near
the floor (below burner inlet) and one opening near the
ceiling (above the highest draft regulator), each opening
with a minimum FREE air passage area of 1 square
inch per 1000 BTUH of total system input.
IF BOILERS ARE INSTALLED ADJACENT TO OTHER
FUEL BURNING EQUIPMENT, THE AREA OF FREE
OPENINGS MUST BE APPROPRIATELY INCREASED TO
ACCOMMODATE THE ADDITIONAL LOAD.
UNLESS PROPERLY CONTROLLED, AVOID THE USE OF
FORCED VENTILATION, SINCE IT CAN CREATE AN
UNDESIRABLE PRESSURE DIFFERENTIAL BETWEEN
BOILER ROOM AND AIR SOURCE.
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