Kuchofuku Fan-Cooled Jackets: 30V Specs and Battery Limits

Short answer: a kuchofuku battery is a purpose-built 70 to 94 Wh pack, and it is the part you cannot import. BURTLE’s AC10 is 80.64 Wh at 405 g, HOOH’s V3001 93.63 Wh at 470 g, and Kuchofuku’s own 25V pack 70.8 Wh at 402 g. All sit under 100 Wh, so they fly carry-on with no airline approval.

A jacket with fans in it, and why Japan has an arms race

If you have seen a Japanese construction worker wearing what looks like an inflated shirt, that is a kuchofuku — a fan-cooled garment that pulls outside air across your skin so sweat evaporates. Two battery-powered fans sit at the lower back; the garment balloons; you stay cool without cooling the room.

The category was invented by Hiroshi Ichigaya, who took early retirement from Sony in 1991 and founded a laboratory that September. His concern was environmental: if Southeast Asia adopted air conditioning at Western rates, the energy cost would be ruinous. His answer was to cool the person, not the room — the “physiological cooler” theory — and the first product went on sale in 2004.

(A terminology note: 空調服 / “kuchofuku” is a registered trademark of his company. That is why every competitor calls its product “fan-equipped wear” instead.)

Why Japan is 30V and the US is niche

Not climate. Not culture. Law.

• Japan: From June 1, 2025, the revised Ordinance on Industrial Safety and Health made heatstroke countermeasures a penalty-backed employer duty on sites where work runs an hour or more continuously, or four or more hours a day, above roughly WBGT 28 / 31°C. Reported penalties reach six months’ imprisonment or a ¥500,000 fine.
• United States: OSHA’s Heat Injury and Illness Prevention rule was published only as a proposed rule on August 30, 2024. Hearings ran in 2025; there is still no finalisation date.

Japanese employers have had to buy cooling gear. Employers elsewhere largely have not. That gap is the whole story — and it is why the Japanese spec race hit 30V while the export versions sit a generation behind.

The 2026 Japanese flagships

Two things stand out. First, BURTLE and HOOH publish the identical 30V/120 L/s headline, but BURTLE’s 30V mode steps down to 23V after one hour while HOOH’s constant-voltage design holds 30V for about 2.5 hours — a real difference the headline number hides. Second, the company that invented the category is no longer the airflow leader: Kuchofuku’s own 25V system tops out at 103 L/s.

Check BURTLE AC10 on Amazon Japan

What you can actually buy outside Japan

Makita — the easy answer. Because the jackets run on Makita’s existing 10.8V/14.4V/18V tool batteries, and because Makita sells worldwide, this is the one you can simply buy. Makita USA lists cordless fan jackets (DFJ201Z, DFJ304Z, DFJ405Z families); Makita India lists DFJ211/212/213. Watch the model prefix: Japan uses FJ/FV, export markets use DFJ — search the Japanese number abroad and you will find nothing. Airflow is lower than the specialist brands (the 2026 A-72132 fan is rated 2.7 m³/min, roughly 45 L/s, though measurement conditions may not match), but you get a locally certified battery and no import problem at all.

BURTLE — same brand, older generation. burtleworkwear.com describes itself as an authorised venture fulfilled from a US distribution centre, and sells a 24V AC09-generation vest kit ($259) and a vest-only AC2064 ($89), plus an Amazon.com listing. Not the 30V AC10. Everything showed sold out at research time.

Kuchofuku — different brand entirely. The group sells in the US as ZIPPKOOL (office in Schaumburg, Illinois): hi-vis cooling jacket $179, vest-only $60, fan $32, battery $95. Its site quotes 20 L/s — a completely different, much lower-output system than the Japanese 25V kit.

HOOH — no overseas channel found. Japanese-language site only, no export page, no distributor, nothing on Amazon.com. The strongest genuinely Japan-only product here, and also the hardest to import (see below).

Check Makita fan jackets on Amazon Japan

The battery is the border

Here is the practical wall. You can import the garment. You generally cannot import the power.

Japanese forwarding services state plainly that standalone lithium batteries cannot travel on any Japan Post service — EMS, air, SAL or surface — and that such items reaching their warehouse can only be discarded or redirected to a Japanese address. Devices with a built-in or attached battery may ship, capped at two units per parcel.

So the realistic playbook for an overseas buyer is:

1. Buy the Japanese garment (fabric ships fine)
2. Buy a locally sold, locally certified fan-and-battery system
3. Understand that mixing brands voids the maker’s stated “genuine combination only” instruction — BURTLE explicitly disclaims liability for third-party combinations, and its AC10 plug will not even physically connect to AC09-generation fans

That third point matters more than it sounds. The 2026 AC10 battery changed its connector: it fits only AC10-1, AC10-2 and IC10-1 fans. Old fans do not work, whatever the seller says.

Flying with one

Every mainstream kuchofuku battery sits comfortably under the 100 Wh line that triggers airline approval:

• BURTLE AC10 — 80.64 Wh
• HOOH V3001 — 93.63 Wh
• Kuchofuku BT25211 — 70.8 Wh

Under FAA rules that means carry-on only, no approval needed, never in checked baggage. Japan layers its own rules from April 24, 2026 on batteries classed as mobile batteries: two per person, no in-flight charging, kept within reach rather than in the overhead bin. Note the HOOH V3001 has USB output, which may cause it to be treated as a mobile battery where the AC10 (no USB) is not — a rare case where a spec-sheet line becomes a travel document.

Summary

Japan’s fan-cooled workwear is a genuinely excellent piece of engineering that regulation forced into existence. But the honest advice for an overseas reader is unglamorous: buy Makita if you want the real thing without hassle, buy BURTLE’s US store or ZIPPKOOL if you want those brands and accept a lower-output generation, and do not plan an import around a battery that cannot legally be mailed to you. For related Japanese heat and emergency gear, see the rest of our English guides.

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