Kair Rectangular Ducting Wall Plate Designed to improve the aesthetics of ducting installations. Use to cover areas where ducting passes through walls or other solid surfaces. Can be used to cover existing round holes. Kair DUCVKC604 rigid or DUCR3M/150/70 flexible rectangular duct will pass through socket. Easy to Fit and Durable. Made in the UK. Max / Min Temperature: +60c / -15c Socket Dimensions W: 156mm, H: 72mm L: 2mm. Outer Dimensions W: 172mm H: 172mm L: 2mm. Compact dimensions. Perfect for flush fitting against ceilings and walls. Perfectly suited for ducting your Bathroom or Kitchen extractor fan, Hydroponics, In-Line Extract Fans, Tumble Dryer, or Cooker Hood. This item can be used as a part of a long ductwork run for a variety of purposes including whole house ventilation, passive stack vent, positive input ventilation, air conditioning, HVAC, and Heat Recovery systems.