Cyclopedia of heating, plumbing and sanitation; a complete reference work . feet per minute. The velocity in the vertical flues may be from 000 to 700 feet perminute, although the lower velocity is preferable. The size of the inlet registers should be such that the velocityof the entering air will not exceed .!.)!) to 100 feet per minute. When the air is delivered through a register at the high velocitiesmentioned, some means must be provided for diffusing the enteringcurrent, in order to prevent disagreeable draughts. This is usuallyaccomplished by the use of deflecting blades of galvanized i
Cyclopedia of heating, plumbing and sanitation; a complete reference work . feet per minute. The velocity in the vertical flues may be from 000 to 700 feet perminute, although the lower velocity is preferable. The size of the inlet registers should be such that the velocityof the entering air will not exceed .!.)!) to 100 feet per minute. When the air is delivered through a register at the high velocitiesmentioned, some means must be provided for diffusing the enteringcurrent, in order to prevent disagreeable draughts. This is usuallyaccomplished by the use of deflecting blades of galvanized iron, setin a vertical position and at varying angles, so that the air is throwrntowards each side as it issues from the register. The size of thevent flues should be about the same as for a gravity system—that is,about 6 square feet for a standard classroom, and in the same pro-portion for smaller rooms. Vent-flue heaters are not usually required in connection with afan system, as the force of the fan is sufficient to supply the required 210 HEATING AND VENTILATION 201. WJJ. SA£ 3 OJ. 1SHVHX3 811 202 HEATING AND VENTILATION quantity of air at all times without the aspirating effect of the ventHues. The method of piping shown in Fig. L73 applies especially tobuildings of large size. In the case of medium-sized buildings, itis often possible to use pin radiation for the main heater, placing thesame well above the water-line of the boilers and thus returning thecondensation by gravity, without the use of pumps or traps. Whenthis arrangemenl is used, an engine with a large cylinder should beemployed, so that the steam pressure will not exceed 15 or 18 pounds,and the whole system, including the direct surface, may be run uponthe same system. This is a very simple arrangement, and is adapted to all build-ings of small and medium size where the heater can be placed at asufficient height above the boilers. Temperature control is usually secured automatically by placingpneumat
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