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duct. Sound power levels are calculated from the fan pressure level measured at a distance of 1m in conformity to DIN 45635 and ISO 3744/3745 according to precision class 2. Duty Curve ... Heater Model Output (kW) Power Supply Nom. Current (A) Inlet Spigot Dimensions W x. Circulation Heaters, also known as “in line heaters,” have uses in many applications. They can use steel, stainless steel, or titanium depending on the application. Lube oil and waste oil applications often use steel for circulation heaters. This is because it is fairly inexpensive compared to stainless steel counterpart. L* : Duct diameter times 2 for circular duct type electrical heaters, diagonal lenght for rectangular duct type electrical heaters. Isıtıcının kanal sistemine bağlantısında (giriş ve çıkış), dirsek, fan, damper, v.b. ekipmanlar ile arasında minimum L* mesafesi kadar düz kanal kullanılmalıdır.
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