WorksheetsIntroduction and Characteristics of Service Spaces
Total questions: 10
Worksheet time: 5mins
In a commercial kitchen with gas ranges, which contaminant mix most strongly drives the need for specialized exhaust hoods and make-up air?
Steam, cooking oils, and combustion gases
Water vapor and benign room air
Dust particles and pollen grains
Carbon dioxide from occupants only
A hospital specifies that bathroom doors should have an undercut and the exhaust fan should move more air than any supply diffuser to keep odors from spreading. Which pressure regime best meets this requirement?
Neutral pressure with balanced airflows
Intermittent pressure with timed fan cycles
Positive pressure with filtered supply airflow
Negative pressure with net exhaust airflow
A commercial kitchen reports strong odors spreading to dining areas and oily haze near cooktops. Which ventilation adjustment most directly addresses both issues while maintaining safe airflow balance?
Increase exhaust and provide tempered make-up air
Seal doors to force more room air to hoods
Reduce hood face velocity to lower drafts
Increase exhaust flow without adding make-up air
A mixed-use facility has persistent odors migrating from bathrooms to adjacent corridors. Exhaust fans currently move 300 L/s while the supply delivers 320 L/s to the bathroom zone. Which adjustment best restores the intended pressure relationship to contain odors within the bathrooms?
Reduce both exhaust and supply by equal percentages
Seal undercuts to reduce airflow exchange entirely
Increase supply to purge odors into corridors
Increase exhaust to exceed supply by a safe margin
You are sizing exhaust for a public restroom using two methods. The room volume is 60 m³. Method A uses ACH at 12 air changes per hour. Method B uses a fixed flow guideline for public toilets of 35–50 L/s per toilet; the room has one toilet and you choose the midrange value. Which method yields the higher required flow rate?
ACH method at 12 ACH requires higher flow
Fixed flow at 42.5 L/s requires higher flow
Neither method; both are below typical needs
Both methods give roughly equal flow rates
A commercial kitchen hood has a 2.0 m by 1.2 m opening. If the target face velocity is 0.6 m/s, which exhaust flow is most appropriate? Use Q = A × Vk, return in m3/s.
0.60 m3/s approximately
0.36 m3/s approximately
0.24 m3/s approximately
0.72 m3/s approximately
1.44 m3/s approximately
In bathroom ventilation, what does the 10% rule recommend to maintain negative pressure?
Reduce both exhaust and supply by 10%
Equal exhaust and supply airflow volumes
Supply airflow 10–15% above exhaust flow
Exhaust flow 10–15% above supply airflow
Which statement best describes the policy on recirculating air from pollutant sources like bathrooms?
Recirculate after coarse filtration only
Do not recirculate extracted contaminated air
Recirculate to save fan energy always
Recirculate when supply airflow is higher
In a retrofit, supply airflow to a bathroom is 200 L/s. To apply the 10% rule, which exhaust setting best maintains the intended pressure regime?
Exhaust set to about 220 L/s
Exhaust set to about 180 L/s
Exhaust set to exactly 200 L/s
Exhaust set to below 150 L/s
When placing an exhaust fan in a long bathroom, which location supports air washing across the space before exit?
Directly beside the door handle
Midway between door and entry
Above the door frame center
Far from door, near far wall
