The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - A/C Vent hose-is it possible to replace with hard line?

**Richard** · 11-23-2022, 02:42 AM

Hard pipe is not necessarily better for air flow. A long radius elbow can add about 30 times the diameter of the pipe in equivalent length. That is like 10' of pipe on 4"". Short radius like pvc and water pipe is even more. Longer the pipe or duct there is more resistance. Flexible pipe with gentle bends can easily flow better in many cases and makes installation easier. Dealt with airflow problems my entire career. Fixed a lot of botched A/C installations due to improper ducting. Small diameter ducting and tight airflow bends in the aftermarket A/C units are only one reason I avoided them.

11-23-2022, 02:42 AM	#7
Richard Senior Member Join Date: Dec 1999 Location: Southern California Posts: 2,970	Re: A/C Vent hose-is it possible to replace with hard line? Hard pipe is not necessarily better for air flow. A long radius elbow can add about 30 times the diameter of the pipe in equivalent length. That is like 10' of pipe on 4"". Short radius like pvc and water pipe is even more. Longer the pipe or duct there is more resistance. Flexible pipe with gentle bends can easily flow better in many cases and makes installation easier. Dealt with airflow problems my entire career. Fixed a lot of botched A/C installations due to improper ducting. Small diameter ducting and tight airflow bends in the aftermarket A/C units are only one reason I avoided them. __________________ Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746 Last edited by Richard; 11-23-2022 at 03:07 AM.