I am in the process of installing a whole house humidifier. I am planning to mount it to the supply side and need to connect the bypass to the return. I'm not sure if I should be using a take-off or starting collar to do this. I've posted pictures below. I apologize if my terminology is incorrect. With the starting collar, do you use screws to secure it to the plenum, or do you simply fold all of the tabs back? One thing that I like about the take-off is that there is an adhesive strip and holes for 3 zip screws. I apologize for the questions. I am learning HVAC for the first time, and I don't have much experience yet.

Starting Collar


  • The problem with adhesive strips is they do fail but then you have the screws , I usually make my own and make the hole tight. Fold the fingers and you have a good mechanical connection, I will usually use a bead of silicone to reduce any leaks. – Ed Beal Mar 5 '18 at 23:35

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.