Weha/Tenax TEC714 Dry Suction Wall: A Silica Dust Capture Spotlight

A dry-finishing bench is the one station in most stone shops where water is deliberately kept off the work — final edge contour, dry polishing on porcelain or sintered stone, a quick touch-up pass that would otherwise mean draining and resetting a wet line. It is also the station that puts the most fine dust straight into the air in front of the operator's face. The Weha/Tenax TEC714 Dry Suction Wall sold on dynamicstonetools.com is built for exactly that bench: a 10 ft stainless-steel back wall that pulls an air curtain across the work zone and captures dust at the source instead of letting it drift into the shop.

This spotlight checks the dimensions, power requirement, airflow and capture rate dynamicstonetools.com publishes for this specific unit against independent documentation for the same TEC714 model, because one figure does not line up — the store lists this SKU as a 480V unit, while outside documentation for the identical 10 ft single-motor TEC714 consistently shows 220V three-phase. It also covers where a fixed suction wall fits next to a mobile dust collector, how it ties into OSHA's respirable-silica rule, and what keeps it running at the rated capture efficiency over years of dry-grinding shifts.

What a Dry Suction Wall Does at a Dry-Finishing Bench

A suction wall is a fixed capture system rather than a tool-mounted one: instead of a shroud and vacuum hose clamped to the grinder, the operator works in front of a stainless-steel panel that is itself pulling air. The TEC714 draws that air horizontally and downward across the bench, so dust generated at the work surface moves away from the operator's breathing zone and into the collector rather than rising past the operator's face the way it does at an open bench with no local airflow.

Pulling air from below knee level rather than from overhead is the detail that makes this a capture system and not just a room fan. General industrial-ventilation practice for airborne contaminants favors moving the air close to the source and below the breathing zone whenever the task allows it, because dust that is already rising past an operator's face is dust the lungs see before any collector gets a chance to catch it. A back wall sized to the width of the bench, pulling continuously while the operator works, keeps that capture point close and constant instead of relying on general shop air changes to clear the area eventually.

A fixed wall like the TEC714 is a different tool from a mobile suction-arm collector such as the Weha TEC740, which this spotlight does not restate in depth. The wall suits a bench that always does dry work in the same spot — a dedicated dry-polishing or edge-detail station — while a mobile arm follows the operator to wherever the dry cut happens to be that day, including jobsite work the wall cannot reach at all.

None of this replaces wet cutting as the first choice. Water at the blade or pad remains the simpler, cheaper way to keep respirable dust down for any operation that can tolerate it, and a dry suction wall exists for the operations that genuinely cannot — a finish that water would ruin, a material that cannot be run wet, or a quick pass that does not justify resetting a wet line. The wall is the engineering control for the dry exceptions, not a replacement for wet work as the shop's default.

A unit sized at 10 ft is a commitment to a dedicated bench, which is why this class of equipment shows up mostly in larger fabrication operations rather than one-person shops: a dedicated dry-polishing or edge-detail cell running sintered stone, porcelain or engineered-stone finishes that call for dry work often enough to justify a fixed station, or a shop running CNC-adjacent hand-finishing work next to the machine. A shop that only runs the occasional dry pass a few times a month is a better fit for a smaller point-of-tool shroud and vacuum than for a 10 ft wall built to run continuously behind a full-time dry bench.

TEC714 Specs: Dimensions, Power and the Store-Listing Gap

What Independent Documentation Shows

Two independent distributor data pages for this exact TEC714 model, both naming Filter Project as the manufacturer, agree closely on the physical unit: a 115 in suction length with roughly 128 in overall length, 43 in width and 96 in height, weighing approximately 858 lb in heavy-duty stainless steel. Both sources also put airflow at roughly 9,400 cfm (about 16,000 m3/h) and dust capture at 99.9 to 99.99 percent, matching the capture figure dynamicstonetools.com already states. The self-cleaning system on both sources works the same way: compressed air from a pressurized tank, fed through membrane electrovalves on an automatic sequencer, periodically shakes dust off the cloth filter sleeves into a catch-basin drawer without the operator opening the unit.

Power is where the two independent sources agree with each other and diverge from the store: both list the 10 ft single-motor TEC714 as a 220V three-phase unit drawing roughly 4 hp, not 480V. The unit also needs a compressed-air supply for the self-cleaning cycle, documented at a minimum of 90 psi, which is a separate requirement from the electrical service and worth confirming the shop's compressor can hold before the unit goes in.

Both independent sources also describe the same accessory package: a roughly 3 ft extension enclosure that extends the capture zone past the end of the main wall, and a catch-basin drawer at the base that collects the dust knocked off the filter sleeves during each self-cleaning cycle instead of letting it fall loose inside the unit. Construction on both is heavy-duty stainless steel rather than painted mild steel, which matters for a dry-dust environment where abrasive fines will wear through a painted finish over years of service in a way they will not wear through stainless.

The Voltage Discrepancy

dynamicstonetools.com's title and spec block for this SKU both say 480V, while every independent documentation source checked for this article — describing the same 10 ft, single-motor, 858 lb unit with matching dimensions and airflow — lists 220V three-phase as the standard factory configuration. That is a real conflict on a detail that determines whether the unit can plug into a shop's existing service or needs new wiring, and it is exactly the kind of gap this spotlight exists to catch. Confirm the nameplate voltage on the actual unit before running any electrical work, rather than ordering service based on either figure alone — a factory-order voltage option may exist that neither source documents clearly.

There is a second, smaller mismatch worth a sentence: dynamicstonetools.com currently carries two separate listings for what appears to be the same 10 ft single-motor TEC714 under two different product handles. This article treats the one assigned to it as the SKU of record; a shop comparing listings on the live site should check that the two have not drifted apart on specifications or options before assuming they are identical.

Sizing, Placement and Electrical in the Shop

A 10 ft suction wall needs a dedicated bench footprint, not just a clear wall. The working area in front of the unit has to stay open on all sides the air curtain pulls from, so stock leaned against the wall or a cart parked too close chokes the airflow the whole system depends on. Plan the dry-finishing station around the wall's width rather than bolting the wall onto whatever bench already happened to be free.

Three-phase electrical service is the detail most likely to catch a shop off guard, regardless of which voltage figure turns out to be correct for a given unit. Plenty of smaller fabrication shops run on single-phase service and do not have three-phase power anywhere on the premises, which means a phase converter or a service upgrade has to be budgeted and scheduled before the unit shows up, not discovered the day it arrives. Pair that conversation with an electrician early, and confirm the compressed-air line for the self-cleaning cycle at the same time, since both are separate utility requirements from a standard 120V or 240V single-phase outlet.

Because this is strictly a dry system, it belongs on a bench that stays dry, not one that doubles as a wet-polishing station on alternating days. Water intrusion into a cloth-filter dry collector is a real maintenance problem, not a cosmetic one, so shops that need both wet and dry capability at the same physical bench are better served by two separate stations than by trying to make one suction wall do both jobs on a schedule.

Plan for the self-cleaning cycle's noise and timing as part of the layout, not as an afterthought. A compressed-air pulse-cleaning system fires periodically rather than running silently in the background, and a bench placed right next to the unit will notice each cycle; locating the station so the cleaning pulse does not interrupt a delicate hand-finishing pass, or simply building the interruption into the workflow, avoids a surprise the first week the unit is running a full shift.

Where a shop needs dry capture in more than one place, or needs it to follow the work rather than the other way around, a mobile suction-arm unit is the better fit than a second fixed wall — the TEC740 mobile dust collector covers that case. A fixed wall and a mobile arm are not competing purchases; shops running both dry benches and occasional dry fieldwork tend to end up with one of each rather than trying to stretch one unit to cover both roles.

Maintenance and Staying OSHA-Ready

The cloth filter sleeves are the part that ages. The automatic compressed-air cleaning cycle knocks dust off the sleeves between work sessions, but the cloth itself still loses some efficiency over time as fine particles work into the weave; one distributor's maintenance note for this collector line recommends washing and drying the sleeves on a cycle measured in months rather than weeks, and replacing any sleeve that has torn or no longer releases dust cleanly under the compressed-air pulse. Treat that as a starting point for a shop's own schedule rather than a fixed rule, since actual sleeve life depends heavily on how much material the station runs and what it runs.

Keep the compressed-air supply itself on the maintenance list, not just the sleeves — a self-cleaning system that is not getting its documented minimum pressure will clean poorly and let the sleeves load up faster than expected, which shows up first as reduced airflow at the bench rather than as an obvious alarm.

The catch-basin drawer at the base needs a routine of its own: emptying it on a fixed schedule rather than waiting for it to visibly fill, and handling the collected dust as the shop's general silica-bearing fabrication waste is handled elsewhere — contained, not swept loose, and disposed of under whatever process the shop already uses for saw and polishing slurry residue. A drawer that overflows does not just make a mess; it lets captured dust become airborne again right at the point meant to be the cleanest part of the system.

A suction wall earns its place in a shop's written OSHA respirable-silica program as one of the engineering controls supporting dry work, alongside whatever wet methods cover the rest of the floor. OSHA's Table 1 for handheld grinders used for tasks other than mortar removal specifies that a dust-collection control must provide 25 cubic feet per minute or greater of airflow per inch of wheel diameter when water delivery is not used, and the standard's overall exposure limits stay fixed regardless of which engineering control a task relies on: a permissible exposure limit of 50 micrograms per cubic meter as an 8-hour time-weighted average, with an action level at 25 micrograms per cubic meter. A bench-level wall like the TEC714 is a room-scale control rather than a tool-mounted one, so it supports a written exposure control plan without replacing whatever point-of-tool capture a specific grinder or polisher still needs under Table 1.

A shop building out a dry-finishing station around this wall is usually solving the same problem covered in more depth in two related guides: Dust Collection Systems for Stone Fabrication Shops for how a unit like this fits the shop's overall collection layout, and Stone Shop Ventilation: Protecting Against Silica Dust Exposure for the broader air-quality picture this one station sits inside. Neither is restated here; both go further into territory this spotlight only touches.