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Ventilation Design Flashcards

7 cards from real HVAC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Ventilation Design flashcards as text

  1. What is the purpose of the 'uncorrected outdoor air intake' (Vou) calculation in ASHRAE 62.1's Ventilation Rate Procedure?

    Answer: To determine outdoor air needed before accounting for system efficiency

    Vou represents the total system outdoor air requirement before applying the system ventilation efficiency correction factor (Ev).

  2. A building with a high window-to-wall ratio in a mild climate is best suited for which passive ventilation strategy?

    Answer: Cross ventilation

    Cross ventilation relies on wind-driven airflow through windows on opposite or adjacent walls, effective when openings are well-positioned and climate is mild.

  3. Which duct leakage class per SMACNA represents the tightest construction standard?

    Answer: Class 1

    SMACNA Class 1 (formerly Class A) allows only 1 cfm per 100 sq ft of duct surface at 1 inch w.g. and represents the most airtight construction.

  4. In displacement ventilation design, supply air is introduced at which location?

    Answer: Low on the wall or floor level

    Displacement ventilation supplies cool, fresh air at low velocity near the floor, allowing it to rise naturally as it absorbs heat and contaminants from occupants.

  5. What is the ASHRAE 62.1 term for the ratio of outdoor air to total supply air at the zone level?

    Answer: Zone outdoor air fraction (Zpz)

    Zpz (zone outdoor air fraction) equals the zone outdoor airflow (Vbz) divided by the zone supply airflow (Vpz) and is used to calculate system-level efficiency.

  6. A garage ventilation system design must account for which primary contaminant?

    Answer: Carbon monoxide (CO) from vehicle exhaust

    Carbon monoxide from vehicle exhaust is the primary design contaminant in parking garages, and codes typically require CO sensors to trigger ventilation.

  7. Which factor does NOT directly affect the required outdoor air ventilation rate per ASHRAE 62.1 Ventilation Rate Procedure?

    Answer: Ceiling height of the space

    The Ventilation Rate Procedure uses occupancy density and area-based rates by category; ceiling height is not a direct input, though it influences volume and air change calculations.