VENTS-US TT 250 10 inch inline fan for ducting with high static pressure application -- ideal solutions for multi-purpose supply or exhaust use in residential and commercial ventilation - - Amazon.com
VENTS-US 146 CFM Power 4 in. Energy Star Rated Mixed Flow In-Line Duct Fan TT SILENT 100 - The Home Depot
Chrome A/C Knob for 2012+ fits Peterbilt 579 Ttrucks