I.D & FD Fans

HUMIAIR fans are of sheet steel construction with backward curved self cleaning blades. The self – cleaning efficiency of an induced draft fan will increase when the tip angle of the blade is enlarged.
These fans are, therefore, suitable for:-

Kitchen Exhaust
Dust Collector System
Fume Exhaust
Welding Shops
Pharmaceuticals
Chemicals
Engineering Industry
Automobiles

Induced Draft
Type Total Pressure mm WG
AMRL 300
AMRM 600
AHRM 900
These fans are available for air quantity from 500 CMH to 10,000 CMH.

Fans that are used to evacuate a space or create negative air pressure in a system are referred to as induced draft fans. Occasionally, manufacturing spaces are required by specifications to be maintained at a specific negative pressure. Induced draft is also used to identify the combustion process used in large boilers. When mechanical ventilation is supplied to these boilers, the heat transfer rat e increases; the boiler can be reduced in size to produce the same amount of energy as natural draft. The induced draft fans used in combustion systems are normally high temperature and extra heavy-duty construction.

HUMIAIR fan wheel has backward curved blades and is designed for either clockwise or anti-clockwise rotation. The blades and wheel are aerodynamically formed to ensure highest efficiency.
APPLICATIONS:

Forced Ventilation
DC Motor Ventilation
Drying Application
Wire Drawing
Dust Proofing / Pressurization

Forced Draft
Type Total Pressure mm WG
ACBL 110
AMBM 600
AHBM 900
AHBH 1200

Air Quantity ranges for air quantity from 500 CMH to 1,50,000 CMH.Fans that are used to pressurize a space or create mechanical air pressure in a system are referred to as forced draft fans. Occasionally, manufacturing spaces are required by specifications to be maintained at a specific positive pressure. This requirement is common in clean room processes for scientific work. Forced draft is also used to identify the combustion process used in large boilers. When mechanical ventilation is supplied to these boilers, the heat transfer rate increases; the boiler can be reduced in size to produce the same amount of energy as natural draft.

NOTE,,,,,,,,,,,,,,,,,,,,,,,,,,,,

In a balanced draft boiler, you actually have both: forced draft (FD) fans supplying air to the furnace, and induced draft (ID) fans removing flue gas. Typically, the FD fans control airflow, while ID Fans control furnace pressure to slightly below atmospheric pressure.

In general though, the choice between forced draft and induced draft is based on how "tight" the system is - if you have leaks, it is better to use ID, as FD will cause product loss.

What is the difference between FD and ID Fan?


id fan maens induce draet ean & fd ean is froce draft fan.both are use in thermal power plant.id fan so connected the airpreheater.fd fan is so connect the eletropre-preted.

ID fan(Induced Draft Fan)basically pulls out flue gas from the furnace of boiler. It is located between dust precipitators(ESPs) and Chimney. Obviously it handles hot air/dust. Whereas, FD fan(Forced Draft Fan)supplies the required air into the furnace for combustion of fuel. It handles air at normal temperature. The capacity/power rating of ID fan will be more than that of FD fan

What is the purpose of a forced draft fan in a boiler?
yes it help to keep the exhaust exhausting by creating positive pressure in the stack. I am assuming you had problems with negative pressure and it backing up and shutting down your boiler?

Forced draft: Draft is obtained by forcing air into the furnace by means of a fan (FDfan) and ductwork. Air is often passed through an air heater; which, as the name suggests, heats the air going into the furnace in order to increase the overall efficiency of the boiler. Dampers are used to control the quantity of air admitted to the furnace. Forced draft furnaces usually have a positive pressure.
Thats the definition, But yes it provides the combustion air if you have limited breathing room for you boiler , and keep the positive pressure in your stack.