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6. 

In calculating free area using louvers, grilles or 

screens for above, consideration shall be given 

to their blocking effect. Screens used shall not be 

smaller than 1/4 inch mesh. If free area through 

design of louver or grill is known, it should be used 

in calculating size opening required to provide free 

area specified. If design and free area is not known, 

it may be assumed that wood louvers will have 20-

25% free area and metal louvers and grilles will 

have 60-75% free area. Louvers and grilles should 

be fixed in open position or interlocked with boiler 

so they are opened automatically during boiler 

operation.

The vent pipe must slope upward from the boiler 

not less than 1/4” for every 1’ to the vent terminal. 

Horizontal portions of the venting system shall be 

supported rigidly every 5 feet and at the elbows. No 

portion of the vent pipe should have dips or sags.

Flue Connection And Venting
Vent installations shall be in accordance with “Venting of 

Equipment”, of the National Fuel Gas Code, ANSI Z223.1/

NFPA 54, or applicable provisions of the local building 

codes.

Consult dimensional drawing for number and size of  

flue pipes required for each size boiler.

Maintain minimum upward slope of 1/4 inch per linear  

foot from the boiler to chimney.

Run flue pipe directly as possible. Keep turns to a 

minimum. Insert flue pipe into, but not beyond, inside 

wall of chimney. Do not connect into a chimney serving 

an open fireplace.

Insulate flue pipe where it passes near combustible  

material.

Rigidly support pipe with hangers and straps.

Extend chimneys at least 2 feet above any object  

within radius of 15 feet, including roof.

Install hood on all flue pipes which extend through roof. 

In most locations, venting of boiler relies on natural 

draft. In as much as energy available from natural 

draft is quite low, serious thought should be given to 

vent system design, i.e., adequate size, use of gradual 

transitions, tees, elbows, etc., close proximity of boiler 

and chimney. On all boilers, vertical risers must be at 

least as large as vent openings on draft-hood. Boiler 

manufacturer makes no specific recommendations 

regarding application of draft inducers that may be 

used with this boiler. If draft inducer is used, it is up to 

installing contractor and draft inducer manufacturer to 

determine proper application.

A.  When installing two openings, one must commence 

within 12 inches from top and other within 12 

inches from bottom of enclosure. Openings shall 

communicate directly, or by ducts, with outdoors 

or spaces (crawl or attic) that freely communicate 

with outdoors. One of following methods must be 

used to provide adequate air for ventilation and 

combustion.

1) When directly communicating with outdoors, 

each opening shall have minimum free area of 

1 square inch per 4,000 Btu per hour of total 

input rating of all equipment in enclosure. Refer 

to Figure 2 on previous page.
2)  When communicating with outdoors by 

means of vertical ducts, each opening shall 

have minimum free area 1 square inch per 

4,000 Btu per hour of total input rating of all 

appliances in the enclosed space.
3)  If horizontal ducts are used, each opening 

and duct shall have minimum free area 1 

square inch per 2,000 Btu per hour of total 

input rating of all appliances in the enclosed 

space.

B.  One permanent opening, commencing within 12 

inches of top of enclosure, shall be permitted where 

equipment has clearances of at least 1 inch from 

sides, 1 inch from back, and 6 inches from front 

of boiler. Opening shall directly communicate with 

outdoors or shall communicate through vertical 

or horizontal duct to outdoors or spaces (crawl 

or attic) that freely communicate with outdoors. 

Openings must have minimum free area of 1 

square inch per 3000 Btu per hour of total input 

rating of all equipment located in enclosure. Free 

area must be no less than sum of areas of all vent 

connectors in confined space.

Vent connectors serving appliances vented by 

natural draft shall not be connected into any 

portion of mechanical draft systems operating 

under positive pressure.