Mechanical Mobility IN HEATING and ventilation

Mechanical Mobility

1. Mechanical Mobility Assignment 1
HVAC, Mechanical Mobility and Fire Safety
Rudransh Tank
A/3596/2021
5th Semester, 3rd Year

2. Stairwell Pressurization Ducts
Elevator Shaft Ventilation Ducts
Trash Chute Ducts
Shaft ventilation ducts
Service Ducts
Fire-Resistant Ducts
Smoke Exhaust Ducts
HVAC Ducts
TYPES OF TOPICS

3. STAIRWELL PRESSURIZATION DUCTS
The purpose of pressurization ductwork is to maintain positive
pressure in building spaces to prevent smoke from entering from
other spaces in which a fire is occurring. It is typically used in exit
stairways, corridors, and lobbies
Guidelines
Airflow Requirements
Stairwell Size
Pressure Differential

4. ELEVATOR SHAFT VENTILATION DUCTS
The purpose of elevator shaft ventilation ducts is to:
Relieve pressure and vacuum caused by the elevator car going up and down
Allow smoke and hot gases to vent out of the elevator hoistway to the outside in the event of a
fire
Allow heat to escape from the building
Elevators, by code, should feature ventilation openings. These openings ensure a high degree
of air exchange.
Guidelines
Airflow Requirements
Duct Size and Shape
Pressure Differential

5. TRASH CHUTE DUCTS
These are installed to transport the trash from each floor
to a central collection area or compactor
Guidelines
Chute Diameter or Size(18 inches to 36 inches in diameter)
Chute Slope
Chute Length

6. Service ducts are passages or conduits that help keep a building's cables and water
pipes within easy access. They can also help conceal wires and pipes throughout the
building.
Service ducts are important because they:
Make maintenance easier to complete with little disruption
Help create the seamless style that most modern architects require
Service ducts require careful planning and should be considered at an early
. stage in the design of a building
Guidelines
Service Requirements
Code Requirements
Occupancy and Use
SERVICE DUCTS

7. SHAFT VENTILATION DUCTS
A ventilation shaft is a vertical passage in a building that serves
as an air passage for ventilation. They are also known as airshafts
or vent shafts.
Ventilation shafts are used in mines and tunnels to:
Move fresh air underground
Remove stale air
Guidelines
Airflow Requirements
Duct Sizing
Pressure Drop

8. Fire-resistant ducts are used in heating, ventilation, and air conditioning (HVAC)
systems to reduce the risk of fire spread. They are made with special materials that
act as a barrier between ducts, slowing down or preventing the spread of flames and
smoke.
Fire-resistant ducts are used in:
Multi-compartment kitchen extract systems
Smoke extract systems
Pressurization ductwork systems
Guidelines
Duct Material
Fire Resistance Rating
Duct Size and Dimensions
FIRE-RESISTANT DUCTS

9. SHAFT VENTILATION DUCTS
Smoke exhaust ducts are used to remove smoke from buildings, ships, or offshore
structures. They enable emergency evacuation and improve firefighting.
Smoke exhaust ducts are made of:
Galvanized steel sheet
Multilayer fabric compensators
Temperature-resistant ceramic fiber sealing strips
Galvanized steel, which is considered fire class A1
ST-E air grilles made of galvanized sheet steel with fixed blad
Guidelines
Airflow Rate
Pressure Differential(Common values range from -0.05 in. w.g. to -0.15 in. w.g.)
Duct Material and Construction

10. HVAC ducts are a system of conduits or passages that deliver and remove air in heating,
ventilation, and air conditioning. They are also called ductwork.
HVAC ducts are connected to the HVAC unit, which filters and heats or cools your home's air
before sending it off. The same duct system carries air from both the AC and the furnace.
HVAC ducts are usually made out of:
Aluminum
Galvanized mild steel
Fiberglass
Guidelines
Airflow Requirements
Duct Material and Construction
Duct Shape and Configuration
HVAC DUCTS