Weil-McLain WM97+70 Specifications download pdf (Page 24)

Part number 550-142-120/0113

WM97+ gas-fired water boiler — Boiler Manual

– 24 –

Figure 20 Combustion and ventilation air openings for WM97+ Direct Vent installations

The WM97+ boiler CANNOT be in the same space with other appliances if clearances around the WM97+ are less

than the recommended service clearances shown in Figure 1, page 9.

Air openings

The required air opening sizes below are FREE AREA,

after reduction for louver obstruction. Note the ex-

ception below for large spaces.

WM97+ boiler

WITH other

appliances in room

WM97+ boiler

WITHOUT other

appliances in room

TWO openings, each at least:

1 square inch per 1,000 Btuh

of all other appliances in the room

(Unless speciﬁed otherwise by

appliance manufacturer)

NO openings are required if the

boiler installation provides at least the

recommended service clearances

shown in Figure 1, page 9.

If the space is smaller than Fig-

ure 1, page 9, provide openings

ONLY as shown in Figure 2, page 9.

Each opening must have a free

area no less than 1 square inch per

1,000 Btuh input of the boiler.

TWO openings, each at least:

1 square inch per 4,000 Btuh

of all other appliances in the room

— OR —

ONE opening **, each at least:

1 square inch per 3,000 Btuh

of all other appliances in the room

(Unless speciﬁed otherwise by

appliance manufacturer)

TWO openings, each at least:

1 square inch per 4,000 Btuh

of all other appliances in the room

— OR —

ONE opening **, each at least:

1 square inch per 3,000 Btuh

of all other appliances in the room

(Unless speciﬁed otherwise by

appliance manufacturer)

TWO openings, each at least:

1 square inch per 2,000 Btuh

of all other appliances in the room

— OR —

ONE opening **, each at least:

1 square inch per 3,000 Btuh

of all other appliances in the room

(Unless speciﬁed otherwise by

appliance manufacturer)

** NOTICE:

Requirements for using the SINGLE air opening

option.

A single combustion air opening can be used for cases b, c or d above (WM97+ with

other appliances in room only), sized as listed, provided that:

• The single opening must communicate directly to the outdoors or to a space that

communicates directly with outdoors (NOT to an interior space).

• The top of the opening must be within 12 inches of the ceiling.

• The free area of the opening must be at least equal to the sum of the areas of all

equipment vent connectors in the space.

SPECIAL EXCEPTION FOR LARGE SPACES

(WM97+ WITH other appliances in room only):

NO combustion air openings are needed if the boiler (and other appliances) are

installed in a space with a volume NO LESS than 50 cubic feet per 1,000 Btuh of all

appliances in the space. That is, total the input of all appliances in MBH (1,000’s of

Btuh), then multiply this total times 50. The building MUST NOT be of tight construction.

Example: For a total input of 500 MBH (500,000 Btuh), the minimum volume would

be 50 x 500 = 25,000 cubic feet.

Boiler room air openings

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Weil-McLain WM97+70 Specifications Page 24

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