Specially Designed Airflow Regulators Limit High Cfm Range Hoods To A Maximum Of Less Than 300 Cfm, Complying With Most Local Codes For Hood Installations Without The Need For Make-Up Air. As A Result, These Kits Give Access To A Broader Offering Of Styles And Designs Within The Standard Best Line Of Range Hoods Without The Need For Costly Add-On Systems In The Home. (Ul)(Li) 3-1/4" X 10"(/Li)(Li) The Individually Packaged Arp Cfm Reducer Kits Come With: (Ul)(Li) A Reducer Plate(/Li)(Li) Screws(/Li)(Li) Installation Instructions(/Li)(/Ul)(/Li)(/Ul)Everything You Need To Make Installation Effortless! (Ul)(Li) Best Hood Models Tested For Use With Respective Cfm Reducer Kits. (Ul)(Li) K210A & P5 Series(/Li)(Li) Dd01 Series(/Li)(Li) Pik & P5 & Ber02Is Series(/Li)(/Ul)(/Li)(/Ul)