Maytag ERV-150, HRV-210 Calculating the Duct Size CONT’D, Installing the Ductwork and Registers

6.0Installation(cont’d)

6.4CALCULATING THE DUCT SIZE (CONT’D)

6.4.2Example of a design for a fully ducted system for a unit having a high speed performance of 222 cfm (See figure 9).

	4”	4”
5”			4” Ø 42 cfm
	5” Ø
		4” Ø
5” Ø	64 cfm
		42 cfm	4”
65 cfm		4”	6” Ø 96 cfm
	6”
6” Ø		6” Ø 84 cfm
		6”	6”
129 cfm
	7”		6”
6” Ø		7”
93 cfm			6” Ø 138 cfm
VI0004		7” Ø	222 cfm
	7” Ø	222 cfm

figure 9

6.5INSTALLING THE DUCTWORK AND REGISTERS

010! WARNING

Never install a stale air exhaust register in a room where a combustion device is, such as a gas furnace, a gas water heater or a fireplace.

6.5.1Fully Ducted System (as illustrated in Section 5.1)

Stale air exhaust ductwork:

•Install registers in areas where contaminants are produced: kitchen, bathrooms, laundry room, etc.

•Install registers 6 to 12 inches (152 to 305 mm) from the ceiling on an interior wall OR install them in the ceiling.

•Install the kitchen register at least 4 feet (1.2 m) from the range top.

•If possible, measure the velocity of the air flowing through the registers. If the velocity is high- er than 400 ft/min. (122 m/min), then the register type is too small. Replace with a larger one.

Fresh air distribution ductwork:

•Install registers in bedrooms, dining room, living room and basement.

•Install registers either in the ceiling or high on the walls with air flow directed towards the ceiling. (The cooler air will then cross the upper part of the room, and mix with room air before descending to occupant level.)

•If a register must be floor installed, direct the air flow up the wall.

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