Exhaust Length, Turns Other than 90º | GE PFDS455, PFDS450, PFDN440

Installation Instructions

WARNING – USE ONLY METAL 4″ DUCT. DO NOT USE DUCT LONGER THAN

SPECIFIED IN THE EXHAUST LENGTH TABLE.

Using exhaust longer than specified length will:

•Increase the drying times and the energy cost.

•Reduce the dryer life.

•Accumulate lint, creating a potential fire hazard.

The correct exhaust installation is YOUR RESPONSIBILITY.

Problems due to incorrect installation are not covered by the warranty.

The MAXIMUM ALLOWABLE length of

the exhaust system depends upon the type of duct, number of turns, the type of exhaust hood (wall cap) and all conditions noted below.

	EXHAUST LENGTH
	RECOMMENDED MAXIMUM LENGTH
	Exhaust Hood Types
	Recommended	Use only for short-
		run installations
	4″ DIA	4″ DIA
	4″ DIA
	4″ DIA
	4″	21⁄2″
	4″
No. of 90º	Rigid	Rigid
Elbows	Metal	Metal
0	150 Feet	125 Feet
1	135 Feet	115 Feet
2	125 Feet	105 Feet
3	115 Feet	95 Feet
4	105 Feet	85 Feet
5	95 Feet	75 Feet

EXHAUST SYSTEM CHECKLIST

HOOD OR WALL CAP

•Terminate in a manner to prevent back drafts or entry of birds or other wildlife.

•Termination should present minimal resistance to the exhaust airflow and should require little or no maintenance to prevent clogging.

•Never install a screen in or over the exhaust duct. This could cause lint buildup.

•Wall caps must be installed at least 12″ above ground level or any other obstruction with the opening pointed down.

SEPARATION OF TURNS

For best performance, separate all turns by at least 4 ft. of straight duct, including the distance between the last turn and the exhaust hood.

TURNS OTHER THAN 90º

•One turn of 45º or less may be ignored.

•Two 45º turns should be treated as one 90º turn.

•Each turn over 45º should be treated as one 90º turn.

SEALING OF jOINTS

•All joints should be tight to avoid leaks. The male end of each section of duct must point away from the dryer.

•Do not assemble the ductwork with fasteners that extend into the duct. They will serve as a collection point for lint.

•Duct joints can be made air- and moisture-tight by wrapping the overlapped joints with duct tape.

•Horizontal runs should slope down toward the outdoors 1/2″ per foot.

INSULATION

Ductwork that runs through an unheated area or is near air conditioning should be insulated to reduce condensation and lint buildup.

PFMS455, PFMS450, PFDN445, PFDN440, PFDS450 specifications

The GE PFMN440, PFMN445, PFDS455, PFDS450, and PFDN440 are part of GE’s innovative family of radio frequency (RF) power transistors designed for various commercial and industrial applications. These devices are renowned for their efficient performance, providing a blend of high power output and reliability, ideal for telecommunications, broadcasting, and other RF applications.

The GE PFMN440 and PFMN445 are members of the RF transistor family that offer robust performance in high-frequency applications. The PFMN440 is particularly noted for its outstanding linearity and power gain, which makes it suitable for use in RF amplifiers and transmitters. Its compact package and advanced thermal management design enable efficient heat dissipation, which is critical in maintaining performance under load. The PFMN445, with a higher power rating, amplifies these characteristics, supporting greater output levels while maintaining linearity, resulting in clearer signal output.

The PFDS455 and PFDS450, on the other hand, are optimized for industrial applications with features that emphasize durability and efficiency. The PFDS455 stands out for its ability to handle higher voltages and currents, making it an excellent choice for applications that require resilience against overloads. The device's superior thermal stability ensures that it performs consistently across a range of operational environments. The PFDS450 shares many of these attributes but is tailored for applications requiring a slightly lower output, making it versatile for different RF circuit designs.

The PFDN440 is designed with specialized technologies that enhance its functionality in digital and mixed-signal environments. It integrates advanced semiconductor materials which reduce power consumption and improve efficiency without compromising performance. This device is particularly useful in applications that demand high-speed operation and reliability, making it a preferred choice for modern communication systems.

All these transistors utilize state-of-the-art manufacturing processes, including advanced doping techniques and epitaxial growth, which contribute to their excellent electrical characteristics. Their high thermal conductivity, high breakdown voltage, and wide frequency response range make these devices suitable for both commercial and specialized applications.

Overall, GE's PFMN440, PFMN445, PFDS455, PFDS450, and PFDN440 transistors are emblematic of modern RF technology, combining power, efficiency, and reliability to cater to a wide spectrum of RF applications.

GE PFDS455, PFDS450, PFDN440, PFMN445, PFMS450, PFMN440, PFDN445 Exhaust Length, Turns Other than 90º

Models: PFMS455 PFMS450 PFDN445 PFDN440 PFDS450 PFDS455 PFMN445 PFMN440