How to Measure CFM and CMM Airflow with TENMARS TM-4002 Malaysia
How to Measure CFM and CMM Airflow with TENMARS TM-4002 Malaysia
In HVAC and ventilation work, measuring air velocity is only part of the job. Technicians often need to know how much air is actually moving through a duct, grille or ventilation system.
The TENMARS TM-4002 Hot Wire Anemometer supports both air velocity and air volume measurements, including CFM and CMM, making it suitable for HVAC commissioning, air balancing, ventilation inspection and facility maintenance applications in Malaysia.
What Is CFM?
CFM means Cubic Feet per Minute.
It represents the volume of air moving through a system every minute and is commonly used in HVAC applications.
CFM may be used when checking:
Air-conditioning systems
Supply air ducts
Return air ducts
Exhaust ventilation
Air diffusers
Ventilation fans
HVAC system performance
A higher CFM means a greater volume of air is moving through the measured area.
What Is CMM?
CMM means Cubic Metres per Minute.
It describes the same basic concept as CFM but uses metric units.
For engineering and HVAC applications where metric measurements are preferred, CMM can be more convenient.
The TENMARS TM-4002 supports both units, allowing technicians to work with different project requirements.
Air Velocity Is Not the Same as Air Volume
This distinction is important.
Air velocity tells you how fast the air is moving.
Air volume tells you how much air is moving through a particular cross-sectional area.
Therefore, two ducts with the same air velocity can have very different airflow volumes if their dimensions are different.
This is why HVAC professionals often need both velocity and volume information.
Measure Air Velocity with TM-4002
The TENMARS TM-4002 provides an air velocity measurement range of:
0.01 to 25.00 m/s
Selectable units include:
m/s
ft/min
km/hr
mph
knots
Its hot wire sensor is particularly useful for relatively low air velocity measurements commonly encountered in HVAC and ventilation systems.
Step 1 – Determine the Measurement Area
Before calculating air volume, determine the relevant cross-sectional area of the duct or outlet.
This may involve measuring the dimensions of a:
Rectangular duct
Square duct
Circular duct
Ventilation opening
Air outlet
Using the correct area is important because an incorrect value will affect the calculated airflow volume.
Step 2 – Position the Hot Wire Probe
Insert the TM-4002 probe into the airflow.
Its telescopic probe extends approximately from 400 mm to 1020 mm, making it particularly useful for measurements inside HVAC ducts.
Ensure that the sensing element is correctly positioned relative to the airflow direction.
Step 3 – Take Multiple Air Velocity Measurements
Air velocity is rarely identical across an entire duct.
For better assessment, technicians may take readings at multiple positions across the duct or outlet.
Measurements can then be evaluated according to the required HVAC testing procedure.
This is especially important when airflow is turbulent or uneven.
Step 4 – Calculate Air Volume
After determining air velocity and the relevant area, the TM-4002 can be used for air volume measurement in:
CFM – Cubic Feet per Minute
or
CMM – Cubic Metres per Minute
This allows technicians to evaluate the actual volume of air moving through the HVAC system.
Why CFM/CMM Measurement Matters
Air volume information can help technicians determine whether an HVAC system is delivering the intended airflow.
It can be useful when investigating:
Weak air-conditioning airflow
Uneven cooling
Poor ventilation
Incorrect air balancing
Low supply airflow
Exhaust system performance
Differences between HVAC zones
Rather than relying on how strong the airflow feels, technicians can work with measured data.
Useful for HVAC Air Balancing
Suppose several rooms are connected to the same HVAC system.
One room may receive significantly more airflow than another.
By measuring CFM or CMM at different locations, technicians can compare airflow distribution and make adjustments where required.
After adjusting dampers or other system controls, measurements can be repeated to verify the result.
99 Sets of Manual Data Memory
When measuring multiple outlets or ducts, recording every result can become inconvenient.
The TM-4002 provides 99 sets of manual data memory, helping technicians retain measurements during field inspections.
This can be useful when checking:
Multiple rooms
Multiple diffusers
Different floors
Different duct branches
Supply and return air points
Different HVAC zones
Temperature and Humidity Measurements
The TM-4002 is not limited to airflow.
It can also measure:
Air temperature
Relative humidity
Dew point
Wet bulb temperature
These additional parameters make it useful for broader HVAC and indoor environmental investigations.
Typical Applications in Malaysia
The TENMARS TM-4002 can be used for airflow measurement in:
Office buildings
Shopping malls
Hotels
Hospitals
Factories
Laboratories
Cleanrooms
Data centres
Commercial buildings
Industrial facilities
Potential users include HVAC contractors, M&E contractors, facility management teams, commissioning engineers and maintenance departments.
Why Choose TM-4002 for CFM and CMM Measurement?
The TM-4002 combines:
Air Velocity + CFM/CMM Air Volume + Temperature + Relative Humidity + Dew Point + Wet Bulb
Its telescopic hot wire probe also makes it suitable for measurements inside ventilation ducts where a larger sensor may be less convenient.
For HVAC professionals who need both air velocity and air volume information, the TM-4002 provides multiple relevant functions in one portable instrument.
TENMARS TM-4002 Hot Wire Anemometer Malaysia
For enquiries regarding the TENMARS TM-4002 Hot Wire Anemometer, CFM Meter or CMM Airflow Meter in Malaysia, contact MTM Precision.
We supply professional testing and measurement instruments for HVAC, environmental, industrial and building maintenance applications.
Contact MTM Precision
MTM Precision Sdn. Bhd.
Showroom & Service Centre
No. 29-1 & 29-2, Jalan Bandar 18,
Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia
🌐 Website: www.mtmpre.com.my
📧 Email: mtmpre@yahoo.com
📱 WhatsApp: +6016-660 7346
14 Aug 2026
