Furna

Every Furna oven travels with its own mouthpiece attached, so residue never builds up in one shared air path. Each oven stains its own stainless steel bowl and coats the ceramic cooling coil and nib screen above it, and each carries its own contacts, where buildup shows as an error code rather than weak vapor.

1. Eject and let it cool: Disconnect the charging cable, then slide the oven up and out. Furna's manual is firm that the oven must not be opened, cleaned or refilled while hot, and the magnets stay hot after ejection.

2. Open and scrape: Press down on the mouthpiece and turn it counter clockwise to release it, then clear the spent herb with the multitool.

3. Strip the mouthpiece: Push the silicone nib out with the multitool, lift the nib screen by easing back the edge of the silicone, then free the ceramic cooling coil by gently squeezing the top of the nib. Note which way round the coil sits before it comes out, and handle it carefully, as it is brittle and breaks if dropped.

4. Clean the mouthpiece parts: Furna allows isopropyl alcohol across the whole assembly: nib screen, ceramic coil, silicone nib and mouthpiece body. Scrub with the included brush where needed. Staining on the steel is cosmetic.

5. Clean the oven without soaking it: The oven must never be submerged. Once scraped out, dip the brush in isopropyl and scrub inside, then stand the oven inverted to dry. Furna's instructions contain no burn off step, so brush and alcohol are the whole method.

6. Rebuild: Reseat the nib screen by resting it on the ceramic coil and turning it in small circles until the silicone closes around its edge. Furna warns against running the device with the coil, silicone or screen missing.

7. Wipe the contacts: Error 3 and Error 4 usually mean residue on the contacts. Wipe the oven's pads with a little isopropyl and clean the contacts inside the body with an alcohol dampened cotton swab.

8. Concentrate oven: Let it cool standing upright so concentrate does not run into the vapor path. Its mouthpiece cleans the same way as the dry herb version, and you should also wipe the underside of the ceramic heater and the contacts inside the oven. That heater sits on magnets and hooks out with the multitool's notch when it is past cleaning.

9. Routine and battery: Brush each oven once it is spent, saving the full strip down for when the draw tightens. Running several ovens lets you use one while another is cleaned. The 3500mAh cell is built in rather than user replaceable, and Furna specifies charging only between 10°C and 35°C.