Why do I need an active makeup air system for my kitchen?

Every time an exhaust fan removes air from your house, an equal volume of air must enter. The air that enters cracks in a home’s envelope to replace air that is exhausted is called makeup air. Two existing building practices affecting makeup air are causing increasing problems for homeowners: homes are getting tighter, and trendy multiple burner stoves require more powerful range hoods to exhaust heat and moist. 

So where does a powerful range-hood get its makeup air? If the house doesn’t have enough random air leaks around windows, doors, and mudsills, the makeup air is often pulled backwards through water-heater flues or down wood-burning chimneys — a phenomenon called backdrafting. Since the flue gases of some combustion appliances can include carbon monoxide, backdrafting is dangerous. In some cases, it can be life-threatening.

In newly engineered homes with range hoods over 400 CFM, there is a new code dictating air replenishment. Although this code has been on the books since 2009, inpectors are now enforcing it. 

International Residential Code IRC 1503.4 Exhaust Makeup Air in a
High-Efficiency Residential Environment reads:

"Exhaust hood systems capable of exhausting in excess of 400 cfm shall be provided with makeup air at a rate approximately equal to the exhaust air rate. Such makeup air systems shall be equipped with a means of closure and shall be automatically controlled to start and operate simultaneously with the exhaust system."

Can I use a Makeup Air System with multiple exhaust fans?    

You can not. The Makeup Air System is designed to work in conjunction with one kitchen exhaust range hood / fan only.

May I install the Makeup Air System in my basement?

Yes, you may. There are some limitations to consider: do not install the makeup air system and supply air duct work directly above or closer than a distance of two feet to any furnace or its supply plenum, boiler, water tank or any heat producing appliances.

Can I install a MUAS in an uninsulated attic/basement?

Yes! Simply insulate the ductwork to the R value required for your area.

Can the Fantech Makeup Air Systems be used with fireplace applications?

Absolutely not, the Fantech system is designed exclusively for residential kitchen cook top ventilation.

What is the best location for a interior register to bring the fresh air into the home?

The supply air register should be installed as close the the exhaust kitchen range hood as possible.

May I install the Makeup Air System in a vertical position?

Due to its component-based, field-assembled nature, the Fantech Makeup Air System offers flexibility as to where and how it can be installed into a building. The installation location should be suitable for periodic inspection and maintenance. It is not required that the individual system components be installed in a linear (straight line) arrangement. 

Can the components be installed with a 90 degree bend instead of a straight line to reduce space requirements?

Yes, the components can be split into segments to support tight quarters.  Be mindful that care should be taken with regards to the heater when altering the air path through the device. A minimum of 24 inches should be installed before and after the heater to ensure linear air flow across the elements. Non-linear air flow can create pockets of low air that can cause the element to overheat and shorten the elements life.

How much space is required for a Makeup Air System?

Maximum length is 9.5 linear feet with optional heater. Minimum length is 8.5 linear feet without the optional heater.

Should I use a heater with a makeup air system from Fantech?

If you are in an area that experiences cold weather in the winter time, you will want to have an additional MUAH heater to temper the air coming into your home.

Is it possible to change the output temperature of the heater?

Yes you can, however the heater is factory set to optimize its performance over a wide range of cfm settings. Remember for the maximum temperature gain lower cfm rates are recommended.

How often should the filter be changed?

Inspection of the filer should be performed at a minimum quarterly basis until a pattern can be established for the particular air quality of the surroundings. Once a determination is made lest frequent inspections may be practical. To order a replacement filter, contact Customer Support.

Where should the Silencer be placed in my Fantech Kitchen Hood exhaust system?

The silencer may be placed anywhere inline between the hood and the remote mounted inline or exterior mounted fan. However, it is normally mounted close to the inlet of the remote fan for ease of installation.

What is the purpose of a silencer and when do I need to use one?

The Fantech LD silencer reduces the "perceived" noise of a kitchen ventilation system by 50-60%. This is particularly important with range hoods where the airflow rate is generally high (300+ cfm).

Does Fantech sell decorative Range Hoods?

No, Fantech sells hood liners which can used inside a wood hood that matches your cabinets or custom made facade such as mantle style hoods.

Fantech sells hood liners in several sizes. The HL Series hood liners are constructed of all stainless steel. They are available in 30", 36", 42" and 48" width. Depth of 18".

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Fantech makes air quality control easy thanks to decades of research, development, and refinement that continue to push the industry forward. Learn which Fantech solution is the best fit in your next project today.