Fire protection of commercial buildings - three-sided ventilation and smoke removal ducts Promat
Fire ventilation systems are a very important component of fire protection of commercial buildings. In protected rooms and escape routes, they are designed to prevent smoke from remaining in quantities that, due to reduced visibility or toxicity, would prevent the safe evacuation of people, but also threaten the safety of rescue teams. For this reason, it is so important to properly design fire ventilation and adapt it to the existing conditions in the facility, and which in practice are often not the easiest.
PROMAT system
© PROMAT
Three-sided ventilation and smoke extraction ducts
One of the problems, especially in underground garages, is limited space and then every centimeter of height in the room that can be "saved" counts. This gave rise to the idea of introducing a new solution - three-sided ventilation and smoke extraction ducts, where the fourth wall of the duct is a solid ceiling (with fire resistance not less than the duct), but fully tested.
PROMAT system
© PROMAT
PROMADUCT
The design of the three-sided PROMADUCT®-500 ducts is slightly different from the four-sided version, since one of the duct walls is the ceiling. The vertical sides of the ducts made of 50 mm thick PROMATECT®-L500 fireproof panels are connected to the ceiling with steel angles covered with a strip of PROMATECT®-L500 panels and fixed together to the ceiling with steel anchors. In addition, a thin layer of mineral wool (max. 10 mm thick) is placed between the top edge of the boards and the ceiling surface. If the ceiling surface is uneven, it is permissible to place mineral wool also between the steel angles and the ceiling (to level the substrate).
PROMAT system
© PROMAT
The three walls (two sides and the bottom) of the ducts are joined at the corners with steel fasteners (staples, screws or nails), and all panel joints (longitudinal and transverse) are sealed with Promat® K84 adhesive, which provides the necessary smoke tightness at the joints. The joints of the vertical and horizontal sides can be offset from each other or can be flush. The locations of these joints are covered on the outside with strips of PROMATECT®-H panels 20 mm thick and no less than 100 mm wide.
For PROMADUCT® - 500 ducts with a width greater than 1250 mm, additional stiffeners made of PROMATECT®-L500 boards with a height equal to the height of the duct and a width of at least 400 mm are used. The distance between these stiffeners is a maximum of 200 mm.
PROMAT system
© PROMAT
Advantages of three-sided ventilation and smoke extraction ducts
Important note: conductors do not require the suspension systems used for four-sided versions, i.e. threaded rods and mounting rails are not used. This function is performed by steel angles fixed to the ceiling, thanks to this solution three-sided cables take up another few centimeters less space.
Another advantage of this system is lower consumption and thus lower material cost and lower labor., resulting in a very economical system. PROMADUCT®-500 ducts do not require expansion joints, and do not deform during a fire.
The simplicity of construction, low cost and availability of materials make the PROMADUCT®-500 system an ideal solution for designers, investors and contractors.
Formore information, visit the company's PROMAT Techniczna Ochrona Przeciwpożarowa Sp. z o.o. page on thePdA portal.
