Flex FT151 Review

Drilling into concrete and masonry creates more than just holes. It creates respirable crystalline silica dust — fine particles that hang in the air, settle on every surface in the room, and pose a serious long-term health risk when inhaled regularly. For tradespeople working in occupied homes, finished offices, and healthcare environments, the cloud of concrete dust from a rotary hammer is not just a nuisance to clean up afterwards — it is a professional liability. Residents do not want their furniture, curtains, and carpets coated in grey powder, and site managers increasingly mandate dust control as a condition of work. Dust extraction attachments for rotary hammers address this problem at the source: they fit onto the tool, surround the drill bit with a shroud connected to a vacuum, and capture the dust before it becomes airborne. The best systems are tool-specific — designed to clip securely onto a particular brand and model of rotary hammer, with brush rings sized to match the bits you use — because a universal-fit extractor that does not seal properly is barely better than no extractor at all. Choosing the right dust extraction attachment means matching it to your specific rotary hammer model, checking that the brush rings cover your most-used bit sizes, and ensuring the vacuum connection is compatible with the dust extractor you already own.

When evaluating a dust extraction attachment for a rotary hammer, compatibility is the first and most important consideration. A tool-specific extractor designed to clip onto a particular brand's rotary hammer will fit securely, maintain its seal during drilling, and not interfere with the tool's handling. Universal-fit extractors that claim to work with multiple brands often compromise on the quality of the attachment, leading to dust leakage around the seal. The brush ring system is the next detail to examine: a good extractor includes replaceable brush rings in different sizes that surround the drill bit, creating a near-seal that allows the bit to rotate and advance while capturing the dust expelled from the hole. As the brush ring wears — and it will wear, because it is in contact with a rotating, abrasive drill bit — it should be easily replaceable without buying a whole new extractor. The rubber seal between the extractor body and the work surface matters too: it needs to be flexible enough to conform to slightly uneven surfaces like textured brick and rough-cast concrete, while being robust enough to survive repeated compression against abrasive masonry. The vacuum connection should be a standard diameter — typically 27 mm, 32 mm, or 35 mm — compatible with common workshop and jobsite dust extractors. Finally, the weight of the attachment matters: under 500 grams is light enough that it does not significantly change the tool's balance or make overhead drilling more fatiguing.

This review examines the Flex FT151 dust extraction attachment, designed specifically for Flex 24 volt cordless rotary hammers. We will walk through the compatibility, the replaceable brush ring system, and the rubber seal design, and assess how effectively the FT151 captures silica dust during overhead, horizontal, and downward drilling in common masonry materials. There are no customer reviews at the time of writing, so we will evaluate the attachment based on its design features and Flex's reputation as a German professional power tool manufacturer. Finally, we will lay out the scenarios where investing in a dedicated dust extraction attachment makes health, cleanliness, and professional sense — and when a universal solution might suffice.

The Flex FT151 is a dust extraction attachment purpose-built for Flex 24 volt cordless rotary hammers — it is not a universal accessory and will not fit rotary hammers from other brands without modification. The attachment clips directly onto the body of compatible Flex 24V rotary hammers, integrating with the tool's form factor rather than feeling like a bolted-on afterthought. The connection is designed to be quick and secure — attach it when you need dust extraction, remove it when you do not — without tools or complicated adjustments. The attachment's body is constructed from durable grey and black polymer with a coated finish that resists mortar dust build-up and is easy to wipe clean. It measures approximately 15.24 × 12.7 × 7.62 centimetres and weighs just 410 grams, adding minimal bulk and weight to the rotary hammer — important for maintaining the tool's balance during overhead drilling where every gram counts.

The FT151's core functionality centres on its brush ring and seal system. The attachment includes a rubber seal that presses against the wall or ceiling surface around the drilling point, creating a partial enclosure that contains the dust as it exits the hole. Replaceable brush rings surround the drill bit shaft, allowing the bit to rotate and advance into the material while the bristles capture dust particles expelled along the bit's flutes. Flex supplies the attachment with at least one brush ring — the listing mentions included components as 'dust extraction tip, brush ring' — and additional rings in different sizes are available to optimise performance for the range of SDS-Plus bit diameters you commonly use. A correctly sized brush ring is important: too large a ring leaves a gap through which dust escapes; too small a ring binds on the bit and impedes drilling. The replaceable design means you can swap rings as they wear — a consumable item in any dust extraction system — without replacing the entire attachment.

In operation, the FT151 connects to a vacuum cleaner or dust extractor via a hose — the exact connection diameter is not specified in the listing, but Flex typically uses standard 27 mm or 32 mm connections compatible with their own dust extractors and most third-party workshop vacuums. When the vacuum is running and the rotary hammer is drilling, the extractor captures the majority of the dust generated — independent testing of similar tool-specific extraction systems typically shows capture rates above 90% for well-maintained attachments with correctly sized brush rings. The rubber seal performs best on relatively flat surfaces; on heavily textured brick, rough-cast render, or irregular stone, some dust leakage around the seal edges is inevitable because the seal cannot conform perfectly to deep surface irregularities. Overhead drilling presents the biggest challenge for any dust extraction system — gravity works against you, pulling dust down and out of the shroud — but a strong vacuum with good suction and a well-fitted brush ring can still capture the majority of particles.

The FT151 is sold as a bare accessory — it includes the extraction attachment body, at least one brush ring, and the rubber seal. It does not include a vacuum hose, a dust extractor, or additional brush rings. You will need a compatible vacuum with sufficient suction — a standard domestic vacuum cleaner may work for occasional use but a dedicated jobsite dust extractor with automatic filter cleaning is strongly recommended for professional daily use, as concrete dust clogs domestic vacuum filters rapidly. The attachment does not require batteries or a separate power source — it is a purely mechanical accessory that relies on the vacuum's airflow. Flex designed the FT151 for their 24 volt cordless rotary hammer platform, reflecting the reality that cordless tools are increasingly used indoors in finished environments where dust control is non-negotiable — and where the absence of a power cable already makes the tool cleaner and safer to use, so adding dust extraction completes the professional setup.

Flex is a German professional power tool manufacturer with a reputation for high-quality engineering, particularly in their surface finishing and polishing tools, and increasingly in their cordless platform. The FT151 benefits from this engineering heritage: it is a purpose-designed accessory for a specific tool ecosystem rather than a generic add-on. There are zero customer reviews at the time of writing, which is typical for specialised accessories that sell in lower volumes than the tools they attach to — the absence of reviews does not necessarily indicate a problem, but it does mean you are buying on Flex's brand reputation rather than verified owner experience. At a price around 71 euros, the FT151 is priced consistently with tool-specific dust extraction attachments from other premium brands like Bosch, Hilti, and Makita. For a Flex 24V rotary hammer owner drilling regularly in occupied properties — kitchens, bathrooms, offices, healthcare settings — the FT151 pays for itself in reduced cleaning time, improved client satisfaction, and compliance with increasingly strict on-site dust control requirements. For occasional DIY use where dust is more of a nuisance than a professional liability, a vacuum held near the drilling point by a helper may be a pragmatic — if less effective — alternative.

The Flex FT151 is the right dust extraction attachment for professional tradespeople who own Flex 24V cordless rotary hammers and regularly drill into masonry inside finished, occupied properties — kitchens, bathrooms, offices, and healthcare settings — where dust control is a health requirement, a client expectation, and increasingly a contractual obligation.