Professional results that a DIYer can be proud of begins with 322 Multi-Purpose HVAC Foil Tape by Nashua. Specially designed for joining and seaming connections in flexible and sheet metal duct work where UL 181 listing is not required. Its extreme high tack, aggressive adhesive provides an instantaneous and durable bond to surfaces. Nashua Tape. Trusted by professionals. DIY approved. Count on Nashua to get the job done right. Color: Metallics.