QTP4B051-18 — Air Force Specialty Code 4b051 Bioenvironvironmental Engineering Mechanical Ventilation Systems

QTP4B051-18 governs ventilation calculations and surveys, including airflow, velocity, area, air changes, pitot traverses, and static pressure.

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  • Publication number: QTP4B051-18
  • Title: AIR FORCE SPECIALTY CODE 4B051 BIOENVIRONVIRONMENTAL ENGINEERING MECHANICAL VENTILATION SYSTEMS
  • Date: 2022-07-21

View QTP4B051-18 on armypubs.army.mil

QTP4B051-18 contains training guidance, task steps, review questions, performance checklists, and answers for ventilation calculations and surveys. It requires measurement, calibration, recording, calculation, and evaluation of ventilation system parameters.

Topics covered

  • Ventilation calculations
  • Face velocity ventilation surveys
  • Capture velocity ventilation surveys
  • Pitot traverse ventilation surveys
  • Static pressure checks
  • Airflow volume
  • Duct measurement points

Questions and answers

What values are needed to calculate airflow volume?

Velocity (V), area (A) and the airflow volume (Q), or mass flow in cubic feet per minute (cfm). (paragraph 1)

How are rectangular duct areas calculated?

For rectangular areas, it is simply a matter of multiplying the length times the width and dividing by 144. (paragraph 3)

How far from an elbow should pitot traverse measurements be taken?

At least 7 duct diameters downstream and one duct diameters upstream from these elements. (paragraph 2)

Where can static pressure be measured?

Static pressure can be measured at the holes drilled in the duct (wall taps) during the baseline survey or with a Pitot tube inserted to the centerline of the duct. (paragraph 3)

How should static pressure readings be taken around a duct?

Four readings should be taken 90 degrees apart around the duct and the measured static pressure values averaged. (paragraph 2)

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