Senza Ergonomic Asynchro Task Chair for 24 Hour Office Use

Senza Ergonomic Asynchro Task Chair, Black

keeps body fatigue and lower back aches from distracting you during long, demanding work shifts. Standard desk chairs often lack the deep adjustments needed to support varied body shapes, leaving employees sore after just a few hours at their computer.

Why standard task chairs break down during round-the-clock shift work

Budget office chairs use cheap, soft foam that compresses permanently over time and rigid backrest brackets that snap under daily stress. The Senza is explicitly engineered for intensive 24-hour usage, relying on high-resilience CMHR foam that bounces back shift after shift and a solid steel mechanism rated for up to 150 kg.

Precision adjustments designed to suit any seating style

• Asynchro Tilt & Back Rake Control: Allows the seat and extra-high backrest to tilt independently, locking into the exact angle your spine needs.
• Adjustable Lumbar & Seat Depth: Customises support to the curve of your lower back while extending or reducing seat depth to relieve pressure behind the knees.
• High-Resilience CMHR Foam Cushioning: Delivers firm, supportive comfort that maintains its ergonomic shape through heavy, continuous use.
• Smooth Gas Lift & Weight Tension Adjustment: Adjusts seat height effortlessly from 47 to 60 cm while matching the tilt resistance to your exact body weight.
• Technical Specifications

Engineered for high-intensity work environments and home offices

This heavy-duty chair adjusts instantly to accommodate multiple team members in 24/7 control rooms or provide personalized, long-hour support at a dedicated home desk. It integrates smoothly into any professional workstation, keeping your posture aligned from morning to night.

Stock availability and logistics

In stock now with dependable courier service ensuring quick UK delivery straight to your office doors.

FAQs

Q: Is this chair suitable for intensive 24-hour shift environments with multiple users?

A: Yes, it is explicitly built and tested for continuous 24-hour usage, featuring high-resilience foam and a sturdy 150 kg weight rating.

Q: How do the asynchro mechanisms work to adjust my sitting position?

A: Levers beneath the seat allow you to independently adjust the backrest angle, seat tilt, seat depth, and lumbar position to find your ideal ergonomic setup.

Q: How quickly will my task chair be dispatched?

A: Every order placed with Office N Stationery moves rapidly to ensure swift UK dispatch to your location.

Shipping & Returns

Reliable UK Delivery

Mainland UK: Orders are typically delivered within 3–5 business days.

Fast Dispatch: Orders are processed and dispatched within 1–2 business days (Monday–Friday, excluding UK Bank Holidays).

Tracked Delivery: Once your order has been dispatched, you’ll receive tracking details by email so you can follow its journey.

Delivery Areas: We currently do not deliver to Northern Ireland, the Scottish Highlands & Islands, Isle of Man, Isles of Scilly, or the Channel Islands.

Delivery Charges: Shipping costs are calculated and displayed at checkout before you complete your purchase.

Easy 14-Day Returns

14-Day Returns: You have 14 days after receiving your order to request a return.

Return Condition: Products must be unused, in their original condition, and returned in their original packaging with any included accessories or documentation.

Damaged or Faulty Items: If your order arrives damaged, faulty, or incorrect, please contact us as soon as possible so we can help resolve the issue.

Return Shipping: For non-faulty returns, the customer is responsible for return postage costs. Where an item is faulty or incorrect, return arrangements will be handled in accordance with our returns policy and applicable consumer protection laws.

Refunds: Once an eligible return has been received and approved, your refund will be processed to your original payment method.

OfficeNstationery Shipping Policy

Last Updated: 21 October 2026

At OfficeNstationery, operated by MENSARK LTD, we aim to provide reliable delivery services across the United Kingdom. Please review our shipping policy for information about order processing, delivery times, and shipping restrictions.

1. Order Processing Times

Processing Window: Orders are generally processed within 1–2 business days (Monday–Friday, excluding UK Bank Holidays).

Notifications: If significant delays occur due to high order volumes or carrier issues, we will provide updates where possible through the contact details supplied with your order.

2. Shipping Methods & Delivery Timelines

We offer standard and express delivery options where available.

Shipping Method: Standard Delivery

Estimated Delivery: 3–5 business days for eligible Mainland UK locations.

Shipping Method: Express Delivery

Estimated Delivery: 2–3 business days for eligible Mainland UK locations.

Charges: Delivery charges may vary depending on your location, order, and selected shipping method. Applicable charges will be displayed at checkout.

Carrier Partners: We work with delivery providers to help ensure your order arrives safely.

Delivery estimates are provided as a guide and may vary depending on the destination, product, and carrier.

3. Areas Where Delivery May Be Unavailable

Delivery is currently unavailable to certain postcode areas, including remote locations and islands.

Restricted areas include:

Scottish Highlands: AB36–38, AB55–56, FK17–21, IV1–39, IV52–54, IV63, KW1–14, PA21–40, PH19–26, PH30–41, PH49–50.

Scottish Islands: HS1–9, IV40–51, IV55–56, KA27–28, KW15–17, PA20, PA41–49, PA60–78, PH42–44, ZE1–3.

Northern Ireland: BT postcodes.

Isle of Man: IM postcodes.

Isles of Scilly: TR21–25.

Channel Islands: GY (Guernsey) and JE (Jersey) postcodes.

Availability may depend on the delivery provider and the products ordered. Please confirm delivery availability for your address at checkout before placing an order.

4. Order Tracking

Once your order has been dispatched, tracking details will be provided where supported by the delivery service.

These may include:

• Your unique tracking number.
• A link to track your parcel through the carrier's website.

Note: Tracking information may take up to 24 hours to become active in the carrier's system.

5. Delayed, Lost, or Damaged Shipments

Reporting Issues: If your order arrives damaged, is missing, or is significantly delayed, please contact us through the Contact Us page on the OfficeNstationery website.

Documentation: For damaged items, please provide your order number and clear photographs of the packaging and product where possible.

Resolution: We will review the issue and work with the delivery provider where appropriate to resolve it. Refunds or replacements will be handled in accordance with applicable consumer protection laws.

6. Failed Delivery & Redelivery

Address Accuracy: Customers should check that their delivery address is accurate when placing an order.

Redelivery: If a parcel cannot be delivered because of an incorrect address, customer unavailability, or failure to collect it, additional delivery costs may apply where permitted by law and disclosed to the customer.

Delivery Issues: If you believe a delivery has failed incorrectly, please contact us through our website's Contact Us page so we can investigate.

7. Contact Us

For questions about our shipping policy or a specific delivery, please use the Contact Us page on the OfficeNstationery website.

Please include your order number and delivery details so we can assist you.

Company Information

Business Name: OfficeNstationery

Legal Company Name: MENSARK LTD

Company Number: 16552046

Shipping policy

Office N Stationery Shipping Policy

Last Updated: 21 October 2026

At Office N Stationery , operated by MENSARK LTD, we aim to provide reliable delivery services across the United Kingdom. Please review our shipping policy for information about order processing, delivery times, and shipping restrictions.

1. Order Processing Times

• Processing Window: Orders are generally processed within 1–2 business days (Monday–Friday, excluding UK Bank Holidays).

• Notifications: If significant delays occur due to high order volumes or carrier issues, we will provide updates where possible through the contact details supplied with your order.

2. Shipping Methods & Delivery Timelines

We offer standard and express delivery options where available.

• Shipping Method: Standard Delivery.

• Estimated Delivery: 3–5 business days for eligible Mainland UK locations.

• Shipping Method: Express Delivery.

• Estimated Delivery: 2–3 business days for eligible Mainland UK locations.

• Charges: Delivery charges may vary depending on your location, order, and selected shipping method. Applicable charges will be displayed at checkout.

• Carrier Partners: We work with delivery providers to help ensure your order arrives safely.

Delivery estimates are provided as a guide and may vary depending on the destination, product, and carrier.

3. Areas Where Delivery May Be Unavailable

Delivery availability may be limited for certain postcode areas, including remote locations and islands. Please check whether delivery is available for your address at checkout before placing an order.

Potentially restricted areas may include:

• Scottish Highlands: AB36–38, AB55–56, FK17–21, IV1–39, IV52–54, IV63, KW1–14, PA21–40, PH19–26, PH30–41, PH49–50.

• Scottish Islands: HS1–9, IV40–51, IV55–56, KA27–28, KW15–17, PA20, PA41–49, PA60–78, PH42–44, ZE1–3.

• Northern Ireland: BT postcodes.

• Isle of Man: IM postcodes.

• Scilly Isles: TR21–25.

• Channel Islands: GY (Guernsey) and JE (Jersey) postcodes.

Availability may depend on the delivery provider and the products ordered. Please confirm these restrictions against your actual shipping arrangements before publishing this list.

4. Order Tracking

Once your order has been dispatched, tracking details will be provided where supported by the delivery service. These may include:

• Your unique Tracking Number.

• A link to track your parcel through the carrier's website.

• Note: Tracking information may take up to 24 hours to become active in the carrier's system.

5. Delayed, Lost, or Damaged Shipments

• Reporting Issues: If your order arrives damaged, is missing, or is significantly delayed, please contact us through the Contact Us page on the Office N Stationery website.

• Documentation: For damaged items, please provide your order number and clear photographs of the packaging and product where possible.

• Resolution: We will review the issue and work with the delivery provider where appropriate to resolve it. Refunds or replacements will be handled in accordance with applicable consumer protection laws.

6. Failed Delivery & Redelivery

• Address Accuracy: Customers should check that their delivery address is accurate when placing an order.

• Redelivery: If a parcel cannot be delivered because of an incorrect address, customer unavailability, or failure to collect it, additional delivery costs may apply where permitted by law and disclosed to the customer.

• Delivery Issues: If you believe a delivery has failed incorrectly, please contact us through our website's Contact Us page so we can investigate.

7. Contact Us

For questions about our shipping policy or a specific delivery, please use the       page on the Office N Stationery website.

Please include your order number and delivery details so we can assist you.

Company Information

 Business Name: Office N Stationery 

Legal Company Name: MENSARK LTD

Company Number: 16552046

Business Name: