Positive Displacement Blower Nomenclature

Many positive displacement blower manufacturers use a similar naming nomenclature to identify some key design facts about their blowers. Knowing the gear size and impeller length can give you a quick understanding of the units capabilities.

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Velocity of a Gas through Schedule 40 Pipe

Quickly estimate the velocity of a gas through Schedule 40 Pipe.

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Blower Briefs

Back in the early 1990's, when pdblowers was a newborn company, we published a newsletter. The purpose of the newsletter was to inform and educate our customers or anyone who was unfortnunate enough to get on our mailing list!

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Roots Whispair Max Rotary Positive Blowers

The Roots Whispair Max was originally released in the 1970's as the "Next Generation" of rotary positive displacement blowers. They were designed to operate at much higher speeds then the units they were designed to replace. The Whispair Max was...

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Silencer Sizing

The normal criterion for silencer type selection is the Pitch Line Veloctiy (PLV) of your blower system. PLV is the peripheral velocity of the timing gear, equal to the product of the gear circumference and the rotative speed of the...

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Material Data for Plates and Sheets

Material Data for Plates and Sheets including lbs/ft2 and conversions from inches to millimeters.

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Conversions

A quick reference guide to conversion factors

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Obsolete Unit

Tabular data for the Roots Whispair Max and Roots AF Positive Displacement Blowers

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Blower and Vacuum Pump Heat Rejection Calculation

Room ventilation requirements must be taken into account when a blower or vacuum pump package is installed inside a building. Use this calculation method to determine the package heat rejection rate.

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Roots RAI Series

Roots RAI Rotary Positive Displacement Blower

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