air requirements

Question 1

what is considered low volume and high volume installations

Answer 1

low volume = under 400,000 btuh, high volume = over 400,000 btuh

Question 2

what tables are air requirements sized from

Answer 2

8.1, 8.2, 8.3 8.4

Question 3

if you have an appliance with a draft control and one without, but they both comply with being air tight, what do you do?

Answer 3

first size the one with draft control from the relevant table. then add the mbhs together and size from table without draft control. whatever is bigger is the answer

Question 4

when sizing air requirements if a duct length is between 20 and 50 ft, what do you do?

Answer 4

increase the size by one size

Question 5

if a building doesnt comply with being airtight how do you size a round duct?

Answer 5

find the answer from table 8.3 or 8.4 and then find the round duct equiv on 8.1 or 8.2 depending if there is a damper or not