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Kitchen exhaust fans are taking moisture and odours from the conditioned space to the outside, much like bathroom fans.

Kitchen exhaust vents, however, may be rated for much higher CFM and will definitely need balancing with the HVAC.

Don't mess around with this stuff - hire the experts who know how to install kitchen hood and countertop fans and who know how to avoid potential appliance vent back drafting.

For sealing around the openings, there are a few important things to remember:

• Use high heat rated sealants and insulation appropriate for around high heat areas.
• Use exhaust vents on the exterior that have back flow stops.
• Consult with your HVAC / kitchen venting expert on the best approaches for air sealing and insulating.