A+ A A-
16 Aug

Rooftop Commercial Fan Systems

Rate this item
(1 Vote)

Commercial kitchen exhaust fans are a vital part of your ventilation system. They remove odors and improve indoor air quality. Commercial kitchen fans also remove moisture, which can increase the level of humidity. High humidity can cause mold, mildew and bacteria growth which can ultimately result in major health code violations.

Common Exhaust Fan Systems

The two most common types of fans are impeller fans and blower fans.

  • Impeller fans move air with blades similar to airplane propellers.

  • Blower fans look like hamster wheels - they are often called squirrel cage fans - and generally are more efficient than impeller fans.

  • Most commercial kitchen exhaust systems have an exhaust fan, ducting and a hood. Some buildings have a central exhaust system, which is one or more fans, drawing air from the entire building (or parts of it) using a network of ducts.

A Heat Recovery Ventilator (HRV) also exhausts moisture and odors. An HRV is a self-contained ventilation system that provides balanced air intake and exhaust. Like a central exhaust fan, it can be connected to several rooms by ducting.

How good is your commercial kitchen exhaust fan: Is your fan...

  • too noisy?

  • not powerful enough?

  • not energy efficient?

  • a fire hazard?

How Do I Choose the Best Restaurant Kitchen Exhaust Fan System?

  1. Choose the quietest, most energy-efficient exhaust fan or blower in the size range required. Most exhaust fan and blower labels have ratings so you can compare noise and energy efficiency. Look for a fan with replaceable parts and permanent lubrication. A fan suitable for continuous use is preferable. Be prepared to pay more for a quality fan.

  2. Select low-resistance (smooth) exhaust ducting. Seal the joints and insulate sections that run through unheated spaces.

  3. Place the exhaust hood where it will not cause moisture damage on exterior surfaces.

  4. If you have heating appliances with chimneys, make sure that fans won't cause the appliances to backdraft.

  5. Install the proper controls.

Things to Consider when Choosing a Commercial Kitchen Exhaust Fan or Blower:

Look for fans labeled 'low noise' or 'quiet,' and check for the HVI or db (decibel) rating. If it is not rated, there is a good chance that it will be noisy. Noisy fans are usually of lower quality, use more electricity and deteriorate until they cease to function. Older noisy fans can also be a fire hazard. Anti-vibration pads or foam tape can insulate the fan housing from wood joists and drywall.

Fan Power Requirements and Airflows
There is more to energy efficiency than selecting an energy-efficient fan. Ducting can affect fan performance. Un-insulated, undersized, or droopy flex ducting, ineffective or dirty backdraft dampers and exhaust louvers can cut rated airflow by more than 50 percent!

Fans create static electricity which attracts dirt like a magnet to the fan and housing. The dirt can encourage mold growth and restrict air movement. Clean fans, housings, back draft dampers and exterior flaps seasonally.

Weather Hoods, Grills And Backdraft Dampers
Even when fans are off, stack effects and wind loads may cause outside air to enter or inside air to exhaust through fan ducting. Check the flaps from time to time to make sure they are clean and working. The exterior exhaust flap or louvers should be clean and in good repair to maintain unobstructed airflow and reduce air infiltration. Most exhaust ducts are fitted with a single flap exhaust hood or triple louver aluminum or plastic exhaust grill. Use weather hoods that lie flat on the wall in driveways and other places where hood-type units could be damaged.  Clean exhaust hoods of lint and nesting materials seasonally to ensure that the flap or louvers are not blocked or stuck open.

High Capacity Systems
High capacity, industrial or oversized exhaust fans, and range-top barbecue fans can cause chimney backdraft. Backdrafting occurs when air is drawn down chimneys, bringing dangerous combustion exhaust gases into the house. Avoid this by selecting sealed combustion heating appliances. If you have appliances with chimneys in your house, and you wish to install high capacity exhaust fans, you will need a matching supply air fan to balance house pressures.

Many ventilation contractors or salespeople are unaware of the effects of large exhaust fans on other house appliances. Make sure that your system is properly installed with supply air and that you have smoke alarms and carbon monoxide detectors to warn you if you have severe chimney back drafting.


  • How to make money without a job

    Does your website have a contact page? I'm having a
    tough time locating it but, I'd like to send you an
    email. I've got some creative ideas for your blog you might be interested in hearing.
    Either way, great site and I look forward to seeing it expand over time.

    How to make money without a job Friday, 18 April 2014 14:18 Comment Link
  • Antony

    This makes you a responsible individual and helps you play your role in the society.

    No other performer in history has received as many awards and accolades as he
    has. The concert features local, regional, and national artists.

    Antony Tuesday, 15 April 2014 19:14 Comment Link
  • teshitaguc

    can you buy clomid in stores http://bimagoki46.revolublog.com - buy clomid does clomid make men more fertile. sns piracetam buy http://benseki50q.pen.io - piracetam buy uk how long can you take piracetam. buy doxycycline hyclate online http://suyasuga50.eklablog.com - where to buy doxycycline side effects of doxycycline mono 100mg. amoxicillin 875 mg price http://mozokumi43.tumblr.com - amoxicillin price amoxicillin pregnancy safe. price of arimidex in canada http://rizuawa34.tumblr.com - buy arimidex anabolic steroids arimidex. price acyclovir http://wasuise25.revolublog.com - buy acyclovir online prophylactic dose of acyclovir pregnancy.

    teshitaguc Monday, 14 April 2014 17:09 Comment Link
  • potazuges

    clomid retail price http://heichiga12.tumblr.com - clomid buy next step after clomid. buy piracetam in store http://ibakosa28.eklablog.com - buy piracetam piracetam effect on mood. doxycycline buy online http://yunaida33w.pen.io - buy doxycycline online can you take amoxicillin and doxycycline together. buy generic amoxicillin online http://kuranoha48y.pen.io - order amoxicillin what happens if you drink alcohol while taking amoxicillin. arimidex prices uk http://nominku57s.pen.io - buy arimidex femara vs arimidex vs aromasin. acyclovir over the counter uk http://biridai39.eklablog.com - buy acyclovir online purchase acyclovir cream.

    potazuges Monday, 14 April 2014 11:44 Comment Link
  • Hip Hop concerts

    These concerts are classified on their website as 50.

    It is one of the main reasons why a large number of people are buying various event tickets online and
    its popularity is increasing with every passing day. You also
    want to make sure you ask for a PR Kit, this contains all of the information you need to know about the artist you are reviewing and will help you tremendously.

    Hip Hop concerts Monday, 14 April 2014 06:17 Comment Link
  • www.youtube.com

    Ӊere aгe a few tips that you can take to the bank when it comes to searϲh engine оptimization, segregated by type.
    Social Media · Seɑrcɦ Engineѕ love Social Media. It is worth
    your time to see if you cօuld add podcasts to your markеting

    www.youtube.com Wednesday, 09 April 2014 10:32 Comment Link
  • 123inkjets coupon code

    Hi there would you mind letting me know which webhost you're utilizing?

    I've loaded your blog in 3 completely different browsers and I must say this blog loads a lot faster then most.
    Can you recommend a good web hosting provider at a honest price?
    Thank you, I appreciate it!

    123inkjets coupon code Saturday, 05 April 2014 01:00 Comment Link
  • gohejihad

    generic cabergoline price http://abunka34.webs.com - where to buy cabergoline online cabergoline 0.25 mg side effects. champix pfizer price http://ragen19.lo.gs - buy champix taking champix and antidepressants. metronidazole buy online uk http://zekimibu20u.pen.io - purchase metronidazole rosacea gel metronidazole. can you get domperidone over the counter http://teogami49.webs.com - domperidone buy side effects of domperidone. cheap flagyl no prescription http://guchidan36.webs.com - buy flagyl no prescription does flagyl cause diarrhea. gabapentin 400 mg price http://mukain19.webs.com - buy gabapentin online can i give my dog gabapentin.

    gohejihad Thursday, 03 April 2014 03:26 Comment Link
  • cafetiere senseo

    Decouvrez dépourvu de jure remettre la fleur buvetier senseo de manière à tout votre cuisine haut mieux
    loyer à cause de le web.

    cafetiere senseo Wednesday, 02 April 2014 17:00 Comment Link
  • Danielleli

    byh8Uther2Gi2Qo2LDiscount Longchamp Bag
    soundsd0Iaree6Gb9Vn8MMichael Kors Purses Outlet
    controlv1Dbeginsl3Bj1Ct7SMichael Kors New Collection
    Longchamp Miami

    Danielleli Friday, 28 March 2014 23:54 Comment Link

Leave a comment

Make sure you enter the (*) required information where indicated.Basic HTML code is allowed.

red gold blue

Copyright by One Call Ventilation 2012. All rights reserved.