Vents have become more than just extractors of bad air, grease and smoke. They have become art pieces. Fortunately, they have also become much cheaper. What once was expensive has become much cheaper.
Hoods that were $999-1499 are now $699-899...
Blower packs for wood hoods with decent CFM are now less than $1000...
How to Vent:
1. Straight duct runs outside are ideal. Turns within the duct greatly reduce efficiency.
2. Recirculating is less ideal, as the heat does not escape.
3. Pro gas cooking requires a minimum of 600 CFM and the depth of the hoods should be a minimum of 24 inches to capture smoke.
4. Inside grills require 1200 CFM at a minimum.