Smoke-Pen
A smoke pen releases a narrow trail of white smoke that makes local air movement visible. The trail bends, disperses or travels with nearby currents, revealing direction around a grille, opening, seal or joint. This gives you a focused view at a chosen point without filling a large space with test smoke. The result is visual rather than numerical.
Smoke pens are used during ventilation, heating, building and environmental checks where air movement is difficult to see. A reusable holder contains a replaceable smoke stick, remaining in service when a wick is spent. Within our Environmental Monitoring equipment, this method complements instruments for airflow, pressure and gas readings.
Why Use a Smoke Pen to Trace Air Movement?
Slight airflow is difficult to judge by sight or touch, particularly where several currents meet. A controlled smoke trail gives that movement a visible path. It might travel towards an extract point, move away from a supply outlet, pass through a joint or circulate near an obstruction.
The small release area makes the behaviour easier to observe around one feature. Air leak detection with a smoke pencil uses this response to indicate a possible path through a door seal, window edge, duct connection or other accessible opening. Directional changes also become visible when fans, doors or ventilation settings change.
The observation remains qualitative. A deflection or swirl shows how the smoke behaved under the conditions present, but it does not calculate velocity, airflow volume, leakage rate or pressure difference. It identifies a position for measured checks without assigning a value or establishing the cause.
How Does a Smoke Pen Make Airflow Visible?
A compatible smoke stick is advanced through the holder and ignited according to the product instructions. Once the flame is extinguished, the glowing wick produces a white trail. Moving air carries the smoke, indicating local direction, turbulence and apparent movement through an opening.
The same response makes positive and negative pressure conditions visible. Smoke drawn into a gap suggests inward movement, while smoke pushed away indicates outward movement. The pen does not measure the pressure responsible. A numerical differential requires suitable Pressure instrumentation and a defined method.
A smoke pencil is another name for a handheld airflow tracer, although designs are not automatically interchangeable. Smoke sources, holders, ignition methods and consumables differ. On compatible models, replacing the protective cap extinguishes the wick so the remaining section can be retained.
Where Are Smoke Pens Used?
Ventilation checks include supply outlets, extract points, grilles, kitchen fans, duct joints and accessible air paths. During HVAC checks, a smoke pencil shows movement before or alongside instrument readings. Air speed and airflow volume require a suitable anemometer from our Air / Wind Speed equipment because smoke supplies neither value.
Around buildings, the trail can indicate movement at windows, doors, service penetrations, cabinets and accessible joints. Releasing smoke close to the feature keeps the observation local. The result reflects that moment, so fan operation, open doors and changing outdoor conditions can alter what becomes visible.
Selected heating, spillage and appliance procedures use visible smoke where the approved method permits it. Smoke may show movement near a hood, flue opening or combustion-air path, but it does not detect carbon monoxide or identify combustion gases. Those measurements require an appropriate Gas Analyser and the relevant sampling procedure. Listed applications also include smoke-detector and alarm checks, although the pen does not certify the system.
What Should You Consider Before a Smoke Test?
Visibility depends on lighting, background contrast and release position. White smoke is easier to follow against a darker background, while glare can hide a fine trail. Nearby movement, warm surfaces and natural convection may change its direction. Comparable observations depend on a consistent position and similar conditions.
The test area also affects suitability. A glowing smoke stick is a combustion source, while its smoke may activate alarms or affect sensitive processes. Site fire controls, local authorisation and restrictions for occupied spaces remain relevant. The product is unsuitable where an ignition source or test smoke is prohibited.
The refill mixture is not classified as hazardous, but test smoke is not intended for deliberate inhalation. Overexposure may cause symptoms, and handling still follows the supplied instructions. Numerical airflow, pressure, gas or leakage results require separate equipment when the rate or cause must be established.
Order Smoke Pens from Celtic Surveys
Celtic Surveys supplies Björnax smoke pen kits with a reusable holder and either three or six wicks. Refill packs contain three or six compatible smoke sticks. The stated burn time is 30 minutes per wick, while the protective cap allows a partly used wick to be extinguished and retained.
Selection depends on whether you need a complete holder or refills for an existing pen. Compatibility should be confirmed because a smoke stick for one holder may not fit another smoke pencil. Pack contents, wick quantity and intended test conditions provide a practical basis for comparison.
Need help choosing a smoke pen or refill sticks for your work? Call 01 801 1335 or email sales@celticsurveys.ie for practical product advice before buying.