Manhole (abbreviation: manholes, inspection openings), is a process in the decoration such as central air conditioning ducts, electrical conduits, and other places or toilet to the sewer manholes are required (technical personnel for service ceiling inside the manhole pipe also known as Master Kong). Birth finished manhole for the domestic market to fill the gaps, widely used in government departments, airports, hotels, hotels, office buildings, villas, shops and other home sites, the product is easy to transport, easy construction, not damaged, with fire, environmental protection , and other characteristics, by the majority of users. Manhole points care plate and hit two kinds of beads, when invited to a single note. Our company specializes in all kinds of aluminum outlet production of central air conditioning and ventilation used: single, double Grille, rain Grille, grille outlet, since the vertical vent louvers, square, circular diffuser, exhaust port, being pressure outlet, fire air, swirl diffusers, spherical vents. The company is strong in technology, superior product quality, credit protection, low prices. Our call to discuss!