Proper Venting is critical for DTF dryers

To properly vent a DTF (Direct-to-Film) dryer, you need to safely and effectively remove heat, moisture, and fumes (such as melted adhesive or ink residue) from your workspace. Here's a step-by-step guide:

Why Venting Matters:

• Heat Control: DTF dryers get very hot (up to 160°C / 320°F).

• Fume Removal: Adhesives and some inks can emit VOCs (volatile organic compounds) during the curing process.

• Humidity Control: Excess moisture can affect curing and surrounding equipment.

• Workplace Safety: Prevents buildup of fumes that may be harmful to workers.

How to Properly Vent a DTF Dryer

1. Install High-Temperature Ducting

Use:

• High-temp aluminum duct (rated for 300°F or higher) We recommend using rigid duct and not the flexible duct work.  (see below why we strongly recommend not using flexible hoses)

• Diameter: Usually 4" to 6", depending on dryer output

• Smooth interior ducting (if rigid) for better airflow and easier cleaning.  The flexible tube will trap the glycol being released and when the dryer turns off that glycol can drip back down inside your dryer. 

• NEVER USE Plastic or PVC ducts – they can melt or catch fire.

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• If you have to make turns in your vent, do not make turns more than 45 degrees - it is better to put two 45 degree angles than one 90 degree.  

2. Connect Duct to Dryer Exhaust Port

• Secure with clamps or foil tape.

• Make sure there are no gaps or leaks.

• Keep duct as short and straight as possible to improve airflow.

3. Vent to the Outside

• Direct the duct to an exterior wall or window vent.

• Install a backdraft damper to prevent air from coming back in.

• Ensure no venting into attic or closed space – it must go outside.

4. Add an Inline Booster Fan (if needed)

If your duct run is longer than 15 feet, install a booster fan to maintain airflow.

• Choose one rated for high temperatures and fumes.

• Position it midway or near the outlet end of the duct. Putting it right at the vent on the dryer could pull too much heat out of your dryer, compromising your temperature and making your dryer to work extra hard to get to temperature.

5. Seal and Insulate (Optional)

• Use metal tape (not duct tape) to seal joints.

• Insulate ducts in cold areas to prevent condensation.

6. Routine Maintenance

• Clean lint and adhesive buildup monthly.

• Inspect vent exit for blockages or backdraft.

Why you shouldn't use flexible hoses for venting the DTF dryer outdoors:

• Because of all the rigids in the flexible tubing you can decrease the airflow by 15-30% if not more, if you have multiple turns in your tubing. It can create a backflow situation, meaning you will just force the harmful VOCs back into your shop.

• When the glycol vents out the gas from the curing process, it is in a gas state, but if the tubing is long, or has multiple twists and turns, the gas will start to condense and pool inside the rigid tubing. Causing it to either leak back down into the dryer after the dryer has cooled down, or create blockage in the tubing.
• DTF printing can release Volatile Organic Compounds (VOCs) from inks and heat-activated adhesive powders during the curing process. These airborne chemicals can cause respiratory irritation, headaches, dizziness, and potentially long-term health issues like serious workplace asthma. To mitigate these risks, ensure proper ventilation, use fume extraction systems, and avoid printing in living spaces. Never eat around the printer...we know that sounds strange, but we've seen lots of shops eat while watching their printers. 

The best solution for venting:

• Install a carbon/HEPA filter if you can’t vent directly outside. The great thing about these units is, when installed correctly it will create a safer breathing environment for your staff.

• Use a fume extractor in tandem for better air quality. We really like Filtrabox - they have a few different units to choose from and they are very simple to use.
  

Article was written by DTF Tech Gurus:
DTF Tech Gurus is an employee-owned company dedicated to delivering expert technical support for Direct-to-Film printing systems. DTF Tech Gurus eliminates the frustration of slow or unhelpful support. Their Remote Service Support ticketing system ensures fast, efficient troubleshooting—handled by experts who genuinely understand the technology and urgency of keeping your production running. 

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Article written by DTF Tech Gurus our official installer and service technicians of the X5 DTF Production Printer.