Rookpennen

Rookpennen, literally “smoke pens” in Dutch, are small handheld devices designed to produce a controlled plume of smoke-like vapor. They are distinct from large fog machines and from vape devices, and are intended primarily for visualization of air flow, stage effects, or artistic photography. Most models are battery-powered and use a replaceable liquid reservoir containing propylene glycol- or glycerin-based fluids, sometimes water-based mists. When activated, the liquid is heated or evaporated and expelled through a fine nozzle, creating a visible smoke trail without combustion.

Applications include HVAC airflow testing, where technicians trace air movement in ducts; film and theatre to create dramatic atmosphere; and macro or product photography for visual effects. Some devices offer adjustable airflow, temperature, and emission duration; fluid types vary by model; using non-approved fluids can cause clogging or residue.

Safety and regulation: Users should operate in well-ventilated spaces and avoid inhaling large amounts of vapor. Use fluids designed for the device; avoid open flames nearby. In some jurisdictions, consumer smoke pens may be subject to safety standards for electrical devices and limit emissions. Check local laws regarding use in public or indoor spaces.

See also: fog machine, vape pen, airflow visualization, HVAC testing.