Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
23 Cards in this Set
- Front
- Back
|
Special fresh air ventilation fittings must be used to connect the fresh air duct to the return trunk duct. true or false |
false |
|
|
The combustion air termination is used to: a) finish the combustion air duct neatly b) add to the cost of the job c) provide a secure mounting point for the end of the combustion air duct d) keep cold air from dropping into the furnace room. |
d) keep cold air from dropping into the furnace room. |
|
|
Both factory built chimneys and vents have a system of parts that are _______ by a recognized testing agency. |
certified |
|
|
Installations requiring you to run forced air heating under the concrete slab are known as: a) spiral heating b) underslab heating c) underground heating d) under concrete heating |
b) underslab heating |
|
|
Roof jacks used on dryer vents are available without which of the following? a) flaps b) dampers c) bird screens d) springs |
c) bird screens |
|
|
What is the fitting used to connect the return air branch runs to the main duct called? a) return take-off b) liner connector c) branch connector d) none of the above |
d) none of the above |
|
|
The material used for venting of the fan to the outside must be metal duct with insulation and a vapour barrier, such as foilback insulation. True or false? |
false |
|
|
Furnaces require air to fuel the fire in side of them. This is called ______ air. |
combustion air |
|
|
The entire underslab ducting system must slope ______ the furnace. a) back to b) level with c) away from |
a) back to |
|
|
When a return air branch run is finished on the bottom with a drywall ceiling, the bottom of the branch run is finished with: a) light gauge metal b) thermopan c) plastic d) drywall |
d) drywall |
|
|
____________ is the uncontrolled leakage of air from a building. |
Exfiltration |
|
|
What does a type L-vent construction consist of? a) an outer casing of Galvalume / airspace / inner liner of aluminum b) an outer casing of Galvalume, air space, inner liner of stainless steel c) an outer casing of stainless steel / airspace/ inner liner of stainless steel d) an outer casing of stainless steel / insulation / inner liner of stainless steel |
b) an outer casing of Galvalume, air space, inner liner of stainless steel |
|
|
The ductwork coming off the plenum for underground heating installations will be ____________ for strength and to make it easier to seal against moisture in the ground. a) round b) rectangular |
a) round |
|
|
A 14 x 8 return air grill: a) is 14" wide by 8" high b) is 14" high by 8" wide c) covers an 14" by 8" hole d) has a free area of 14" x 8" |
c) covers an 14" by 8" hole |
|
|
What is the heart of the heating, ventilation, and air-conditioning (HVAC) systems? a) the furnace heat exchanger b) the air recirculation fan c) the furnace plenum d) the gas valve and burners |
b) the air recirculation fan |
|
|
The air is ________ from the central heating or cooling unit by the supply air system. |
distributed |
|
|
The return air part of an HVAC system consists of the parts to bring air back from the _____ to the furnace. |
occupied space |
|
|
Rectangular duct takeoffs include all of the following except: a) top take offs b) side take offs c) universal take offs d) saddle take offs |
d) saddle take offs |
|
|
The ratio between the width and depth of duct should never exceed: |
4:1 |
|
|
Name 4 things that can cause dynamic loss in an airstream |
1. material duct is constructed from ( smooth or rough) 2. the shape of the duct 3. changes in direction 4. Changes in cross sectional area |
|
|
Dynamic losses on flexible duct are approximately ____ times as great per foot as in smooth duct. a) 4 b) 7 c) 10 d) 12 |
10 |
|
|
Dynamic losses occur in both rectangular and round duct. True or false? |
true |
|
|
You should always install 2 elbows together (back to back) True or false? |
false |
