Patent ID: 8833013

Claim:
An air duct termination collar comprising: a. a main body having a substantially cylindrical inner surface having a longitudinal center axis, the main body open at opposing first and second longitudinal ends to form a substantially unhindered air passageway therethrough; b. a plurality of vertical attachment arms projecting radially from the main body, each arm having a plurality of surfaces defining attachment voids aligned orthogonal to the center axis of the main body; c. each vertical attachment arm having a vertical attachment surface for attachment to a vertical side of a support joist; d. each vertical attachment arm having a narrow region between the attachment voids and the main body forming a break point for removal of the portion of the attachment arm radially outward from the break point; e. at least one horizontal projection having a horizontal surface through which are provided a plurality of surfaces defining voids aligned parallel to the center axis of the main body for attachment to a horizontal bottom side of a support joist; f. a substantially cylindrical air duct attachment surface on the radially outward surface of the first longitudinal end of the main body; and g. a substantially cylindrical radially inward diffuser attachment surface on the second longitudinal end of the main body.