Zephyr AK2536BS Manual download pdf (Page 9)

MODELS MUA006A • MUA008A • MUA010A

Page 9

FREQUENTLY ASKED

QUESTIONS (FAQS)

1. What does an automatic make-up air

damper do?

An automatic make-up air damper (the “Damper”) provides a pathway for

fresh air to enter a home from outdoors when a compatible range hood is

operating. When the hood blower is operating The Damper opens thereby

creating a known, controlled point for fresh air to enter the home while air

is being exhausted from the building by the range hood.

By operating in this manner, the Damper provides two key benefits for the

home:

• It facilitates air e

xchange between indoors and outdoors, by helping to

allow fresh air into the home to replace air which is exhausted out of

the home.

• By allowing fresh air into the building when a compatible exhaust device

is on, the Damper helps to avoid negative pressure conditions within

the home which may interfere with the proper operation of combustion

equipment within the home.

Overall, the Damper lets your range hood do its job more effectively and

without interfering with the proper operation of other home systems.

2. Which automatic make-up air damper do I need?

The

required amount of make-up air will vary for each home and the

amount of exhaust ventilation provided within the home. As a general rule

of thumb, Zephyr recommends sizing the make-up air damper as follows:

- One 6” damper for ventilation rated up to 600 CFM

- One 8” damper for ventilation rated up to 1000 CFM

- One 10” damper for ventilation rated up to 1300 CFM

However, Zephyr highly recommends that a qualified professional HVAC

contractor be consulted after installation to ensure there is no negative

pressure in the home when the range hood

is operating. If negative

pressure exists, then additional make-up air should be added.

3. Does the “Damper” provide combustion air for combustion

appliances like a water heater or

a furnace?

No. The Damper helps to replace air which is exhausted by a compatible

range hood. But it does NOT help to replace air which is drawn from the

indoors by a combustion appliance like a natural gas water heater, and it

should not be relied upon to perform this function. One main reason for

this restriction is that the Damper is only open w

hen the range hood that

it’s connected to is operating. So there is no assurance that the Damper

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Other means must be provided to ensure adequate combustion air for

these appliances.

4. How do I know if I need make-up air for my

range hood?

In some cases the local building code may tell you that make-up air is

necessary. For example, some codes specify that range hoods with

exhaust flows of 300 cubic feet per minute (CFM) or higher need a

mechanical syst

em to introduce make-up air.

In other cases, make-up air for a range hood is desirable regardless of

whether code requires it. This is especially true for:

• larger range hoods (those over 300 cfm)

• homes which are well air-sealed

• homes with atmospherically vented combustion appliances (i.e. a

water heater or natural draft fireplace), which are more susceptible to

improper venting if depressurization occurs.

In homes with any one of these factors make-up air is advised. And in

homes with more than one of these conditions make-up air for the range

hood is strongly advised.

5. What a

re the benefits of providing make-up air to replace air

which is exhausted out of the home by a range hood?

Range hoods are designed to pull out pollutants like cooking odors or

moisture at the source, so they don’t linger in the home. Because these

fans pull air out of the house, this air needs to be replaced with “new” air

from outdoors. Normally this make-up air enters the home through cracks

and holes in

the “shell” of the building. But modern homes are air-sealed

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Plus some exhaust fans

like range hoods exhaust a lot more air than can

be replaced through normal cracks in the building shell.

By providing an intentionally designed opening for fresh air to replace

air which is exhausted out by the range hood, several important benefits

result:

• The make-up air entering the home comes in at a known point, where

it is also filtered

• Negative pressure conditions, which could arise if air is exhausted from

a home without being replaced by new fresh air, are prevented

• Pollutants are more effectively exhausted from the home while fresh

replacement air is dra

wn into the home, improving ventilation

6. Does ASHRAE 62.2-2007 – “Ventilation and Acceptable Indoor

Air Quality in Low-Rise Residential Buildings” – require the use

of a make-up air damper?

ASHRAE 62.2-2007 does not specifically require make-up air dampers. In

a few limited circumstances, this standard does require that net exhaust

flows from a house be limited. For example, Section 6.4 of the standard

limits the net exhaust flow from a home’s two largest exhaust appliances

if the home has atmospherically vented or solid-fuel burning appliances

located within the pressure bo

undary of the house. This standard is

available at www.ashrae.org.

7. Can I use the Zephyr Automatic Make-Up Air Damper with other

equipment in my home?

No. The Zephyr Automatic Make-Up Air Damper may only be used with

compatible Zephyr range hoods over 300 CFM.

8. What are the different ways that the Damper can be installed in

my home?

The most common way to install the Damper is to connect it to a home’s

central duct system. In this application, outside fresh air enters the home

through the Damper and is then routed and distributed through the home’s

ducts.

9. What

happens after a power outage?

The Damper system and the associated exhaust devices will not lose their

settings following a power outage. So the system will resume its normal

operation following a power outage, based on the settings it used prior to

the outage.

Regular maintenance is necessary to ensure the proper operation

of the Damper system. Failure to conduct such routine maintenance

can jeopardize the ability of the Damper to introduce fresh air into the

home. Regular maintenance should include the following activi

ties:

• Clean the outside bird screen to ensure it is free from debris and

open to allow fresh air to enter.

• Clean or replace the interior filter(s) which serve to filter fresh air

before it enters the home.

• Maintain a clear opening at the outdoor end cap, which means pre-

venting the buildup of snow, leaves, or vegetation at the end cap.

• During regular HVAC maintenance, have the mechanical contrac-

tor inspect the Damper system for proper operation.

MAINTENANCE

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Zephyr AK2536BS Manual Page 9

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