Air Supply

Question 1

With air supplied outdoors what will happen if the opening is not large enough?

Answer 1

Incomplete combustion and result creating Aldehydes, carbon monoxide and soot

Question 2

With air supplied from outdoors, what will happen if the opening is too large

Answer 2

Too much cold air enters in the winter, inviting someone to block off the opening

Question 3

The formula to size the air supply opening to be installed in the wall

Answer 3

1 in.² for every 1000 BTU of appliance input

Question 4

Air Supply determination what is the method of calculating the size of opening from the building into the mechanical room?

Where must this opening be?

Answer 4

One square inch for every 1000 BTU of appliance input

Located between 6 and 18 inches from floor level, which means that the maximum opening will be 12 inches

Question 5

Location of combustion air opening if one or more of the appliances have a draft hood or barometric damper

Answer 5

There will be a second opening the same size as the one for combustion, but it will be placed high on the wall

Question 6

Where must the Air Supply duct be ran?

Answer 6

This duck must be run from the outdoors and terminate within 1 foot above, and 2 feet horizontally of the appliance burner having the largest input

Question 7

When will a square duct may be used

Answer 7

If the air supply deck area is 9 in.² or larger at the smallest dimension of the duct is not less than 3 inches

Question 8

What is the minimum height for an outdoor air supply opening?

Answer 8

1 foot above ground level

Question 9

How is the outdoor air supply sized when install installing appliances with draft control devices?

Answer 9

The opening must be permanent and must be at or deducted to a location that is no more than 18 inches above the floor level and not less than 6 inches above floor level

Question 10

How was the air supply opening size calculated for power burners?

Answer 10

All inputs over 400,000 BTU require 1 in.² for each 30,000 BTU

Question 11

What is the smallest allowable dimension for a grill or screen?

Answer 11

Quarter inch

Question 12

When a mechanical fan supplies, the air what has to control the gas

Answer 12

A manual reset control

Question 13

A sheet metal adjustable 90 elbow has a resistance to natural airflow equal to how many feet of straight pipe

Answer 13

10

Question 14

Where should the ventilation opening be placed?

Answer 14

Near the top of the room as possible