A) Types of products

• Ducted rangehoods
  - Directs air from kitchen outside the house through a metal duct via wall or ceiling.  This type is the most effective
  - Filters are usually aluminum filters and have to be cleaned regularly for maximum efficiency and safety
  
  
• Recirculating rangehoods
  - This rangehood filter impurities from the air and then recirculates clean air back into the kitchen.  Uses carbon filters.  Not as powerful as ducted rangehood
  - The carbon filters cannot be reused

B) Things to consider when purchasing

• Measure allotted space carefully before purchasing
• A range hood is a useful investment because it can stop grease, smoke, cooking odors from traveling through your house
• Take note of the decibel measurement.  The more powerful the motor, the louder the noise
• Look for a model with dishwasher-safe stainless steel filter
• Know the extraction rate.  Higher extraction rate will vent a larger amount of air.  If you do a lot of cooking, get one with an extraction rate of around 700m³/h
• Noise:
       - Noise levels varies for different types of rangehoods.  Manufacturers provide decibel rating
       - You can invest in a rangehood with a sound-proofed motor