Your other option, the filtered models, do not do as well because they will recycle the same air within your building only they run it through a charcoal filter first to make it cleaner. While a ducted model is preferred in most situations, they can be a bit more on the expensive side. Not to mention, you may not have the space necessary to fit the ducts. It is important that you find industrial extractor fans that have been built to last.
One of the common drawbacks of industrial extractor fans is how loud they are. This can be such a problem that most restaurant managers choose to run them only when the amount of steam, smoke, and pollutants in the air reaches an intolerable level. However, there are some high end models that can run in a Quiet Mode that doesn’t make that much noise at all and even can be run all the time if you choose.
Most professional cooks prefer to have access to both gas and electricity for cooking. They need bigger ovens to accommodate larger trays and baking sheets and often their stovetops have integrated charcoal barbecues, grills and griddles. Cooking on a large scale generates a huge amount of heat so an extractor hood that more than covers the gas or electric rings reduces heat and steam to maintain a pleasant working atmosphere.
Contact a Leasing Company - A restaurant equipment leasing company will ensure that you get adequate supplies, equipment and free maintenance on your new kitchen equipment, all for a monthly, quarterly, or yearly rate. This rate will be cheaper in the short run than buying your own equipment but over time you could probably have saved money by buying your own equipment. On the other hand buying your own equipment will not get you new kit every couple of years so leasing is still your best bet if you are just starting out. Be sure to find out from the company all the terms and conditions involved, such as what happens if you need to end the contract early - just in case the kitchen turns out to not be as busy as expected! You can find out off local businesses what leasing companies they use - and this is a great way to quickly find out the best companies.