Exam Prep IFGC, MMC, Manual D Flashcards
A valve designed to activate when the fuel gas passing through it exceeds a prescribed flow is a ____.
excess flow valve
When only indoor combustion air is used, a gas water heater located within a 10 foot by 10 foot room is required to have a minimum ____ cubic feet per 1,000 Btu/h.
50
The approximate number of _____ threads are required to be cut for 3/4” metallic piping.
10
Plastic gas piping requires a ____ tracer wire be installed with a minimum ____ AWG.
yellow, 18
Primer for plastic piping used in appliance venting must be what color?
contrasting color
Vented gas decorative fireplaces shall be tested in accordance with ____.
ANSI Z21.50
A commercial kitchen ____ hood is mounted directly to the face of the appliance.
eyebrow
An evaporator cooling coil drain must be a minimum ____ in size.
3/4”
Nail stations located within a specialty shop must have a source capture system capable of exhausting a minimum ____ cfm per person.
50
A valve regulated lead acid battery producing manufacturer with a 10 foot by 10 foot room used to store batteries must have a minimum ____ cfm continuous ventilation.
100
A grease reservoir for a Type 1 hood shall ____.
Be located on the bottom of the horizontal duct
Have a depth of not less than 1”
Have a length and width not less than 12”
Energy recovery ventilation systems shall not be used in what systems.
commercial kitchen exhaust systems serving a Type I or Type II hood
Fire sprinkler piping exposed within a plenum must have a flame spread of not greater then ____.
5 feet
The maximum horizontal length of a single wall connector used to vent an oil furnace shall be ____ percent of the height of the chimney or vent.
75
Water heaters used for space heating and potable heating requires a mixing valve be installed to limit the maximum potable water temperature to ____ degrees F.
140
When ____ pounds of a Group 1A type refrigerant is changed in a refrigeration system, the code official must be notified.
220
Refrigeration piping joints located within an air duct must be tested to ____ percent of the higher of design pressure or pressure relief device.
150
Hydronic piping using PEX-AL-PEX pressure pipe shall not have a solder joint occur within ____ of the pex pipe.
18”
Fuel oil tank removal or abandonment must be done in accordance with ____.
International Fire Code
Flammable gas or liquid heat transfer fluids for solar systems shall ____.
not be utilized
What is the friction rate for a 120 foot duct system with a pressure drop of 0.4” wc?
.33
What is the required furnace cfm with a heating load of 86,000 btu’s using an altitude correction factor of 2 and the supply air is 120 degrees and the room air is 70 degrees?
856
What size round galvanized duct is required with a 0.1 friction rate at 700 cfm?
12”
What is the equivalent length for a round pipe attached directly to a plenum in a return air system with a referenced velocity of 700 fpm at 0.08 IWC per 100 feet?
40 feet
What is the equivalent length of a 30 degree elbow at 800 fpm and a 1.5 R/D ratio?
3.33
How many cubic feet of space would be required to use the standard method of combustion air if you has a space with a 80,000 Btu fan assisted furnace, 40,000 Btu natural draft water heater, and a 32,000 Btu gas dryer?
7,600 cu ft
What maximum total appliance btu input is allowed for an open basement measuring 30’ x 64’ with a 9’ ceiling to be able to use the standard combustion air method?
345,600 Btu
A residential home has a total heating load of 62,000 Btu’s and designed with a furnace blower operating at 1240 cfm. How many cfm’s would be required for a bedroom with a heating load of 5,400 Btu’s?
108 cfm’s
Room CFM = (Blower CFM * Room Load) / Equipment sizing load
A blower with an external static pressure of 0.54 IWC connected to a 60 foot duct includes a register and grille of 0.025 IWC each, a cooling coil of 0.16 IWC and a filter of 0.12 IWC. What is the total available static pressure remaining?
0.21 IWC
A 75,000 Btu 95% furnace has a temp rise of 47 degrees. What is the required cfm with an altitude correction factor of 1?
1378
HVAC cooling ducts exposed to the outdoors should have ____ installed to prevent condensation from forming on the exterior of the duct.
vapor retarder
Mechanical equipment installed in a private garage must be installed in accordance with the ____.
2015 Michigan Residential Code
The air temperature in non-metallic ducts shall not exceed ____ degrees F.
250
Commercial kitchen grease ducts horizontal clean out must be a minimum ____ size.
12” x 12”
In a commercial duct system, how many duct classifications exist?
14
7 positive
7 negative
