Why This Matters in December Spring permits are already stacking up. HVAC design delays are the #1 reason LA kitchen projects stall. HVAC Ducting in LA Kitchens Range hoods over 400 CFM  require makeup air systems . Common challenges: Long duct runs in slab homes Limited ceiling cavities Noise compliance issues Slab vs Crawlspace Homes Slab foundations:  Sawcutting concrete adds cost and permits Crawlspaces:  Easier duct routing, lower labor Pasadena and Sherman Oaks homes di