The takeoff on a 90, in the context discussed in the reference, refers to determining the amount of material needed for a 90-degree bend in a pipe or ductwork, and a simple way to approximate this is by multiplying the size by 1.5.
The referenced YouTube video segment mentions a simple method for approximating the takeoff, which is to multiply the size of the pipe or duct by 1.5. It also mentions the importance of considering whether the bend is a long or short radius, as this will affect the precise takeoff measurement. More accurate measurements would be needed for critical applications, but multiplying the size by 1.5 provides a helpful estimate.
