Closer type of fire rated doors

Date:Jan 06, 2020

1, Surface Closer 

A, 80% usage for fire rated door.

B, Easy for installation.

C, Different weight standard.

D, Fire rated max 3 hours.

E, Cheap.

F, UL certification.

2, Conceal Closer

A, less usage for fire rated door.

B, Expensive.

C, Different weight standard.

D, Most use for wooden door.