DuraVent DuraTech 5" Black Round Ceiling Support Box made-in-canada most Wi-Fi thermostats use 24volts

most Wi-Fi thermostats use 24volts and are not compatible

surround sound

wet lava rock could crack or pop out when it becomes hot

Do not place glass droplets

DuraVent DuraTech 5" Black Round Ceiling Support Box made-in-canada most Wi-Fi thermostats use 24voltsWith a Thermal Tech blanket insulation encased between dual walls, DuraTech offers the optimum in safety and performance. It keeps the outer wall of the chimney cool, while ensuring high flue gas temperatures for optimum draft performance. The inner wall is 25% thicker than competitive chimneys for an extra margin of safety. No locking bands or mechanical fasteners required. DuraTechs sleek 1" wall design provides for easy installations through 16" on