---
title: "Types of doors by working mechanism"
subject: "Building Technology"
chapter: 6
key: "semester_6/building_technology:door-types-working"
source: https://www.bctengineer.com/q/semester_6/building_technology/door-types-working
site: BCT Engineering
---

# Types of doors by working mechanism

Building Technology · Chapter 6: Doors and windows

- Asked in: 2078 Chaitra, 4 marks; 2078 Baisakh, 2 marks (asked 2 times)
- Video: [Types of Doors - Building Construction](https://www.youtube.com/watch?v=Rk7fxgiXxrM) — ALE Review - ArkiVHEY
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_6/building_technology/door-types-working
- Whole chapter: https://www.bctengineer.com/md/semester_6/building_technology/chapter-6

## Question

Explain the various types of door based on working mechanism (nature of working operations).

## Short answer

Doors are classified by working mechanism: hinged doors swing on hinges, sliding doors move on rails, revolving doors rotate around a central pivot, and rolling shutters coil upward. Other types include double-acting, accordion, overhead, collapsible, and pivoted doors.

## Answer

Doors are classified by the way they work (open or move):

| Type | Working |
|---|---|
| Hinged (swinging) door | Leaf opens on hinges about a vertical edge; single or double leaf; most common |
| Double-acting (swing) door | Hung on double-action spring hinges so it opens both ways; hospitals, restaurants |
| Sliding door | Leaf slides on rails parallel to the wall; saves swing space |
| Sliding-folding (accordion) door | Leaves fold like an accordion; partitions in halls |
| Revolving door | Three or four leaves rotate about a central pivot; hotels, banks, air-conditioned buildings |
| Rolling shutter | Steel strips roll up on a drum above the opening; shops, garages |
| Overhead / up-and-over door | Leaf swings up to lie horizontally under the ceiling; garages |
| Collapsible door | Steel channels pivoted together so the leaf folds; lifts, shops |
| Pivoted (tilting) door | Leaf turns about a pivot at the middle; rare |

```text
 Hinged         Sliding         Revolving       Rolling shutter
 +---+--+       +--+--+         +---o---+       ======= (drum)
 |  /   |       |  |>>|         |   |   |       |||||||
 | /    |       +--+--+         |---+---|       |||||||
 +---+--+       rails           +---o---+       |||||||
```

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. What is the main advantage of a sliding door?
   A. It opens in both directions
   B. It saves swing space
   C. It seals air-conditioned space
   D. It is the cheapest
   Answer: B. The leaf slides on rails parallel to the wall, so no swing space is needed. (Key point: Sliding door advantage)

2. Which door has 3 or 4 leaves on a central pivot and is used in hotels and banks?
   A. Double-acting door
   B. Overhead door
   C. Revolving door
   D. Tilting door
   Answer: C. A revolving door rotates about a central pivot, suited to air-conditioned buildings. (Key point: Revolving door)

3. A double-acting door is fitted with
   A. Spring hinges so it opens both ways
   B. A drum above the opening
   C. Rails along the floor
   D. A central pivot with four leaves
   Answer: A. Spring hinges let it swing either way, as in hospitals and restaurants. (Key point: Double-acting door)

## Related in Building Technology

- [Types of doors based on shutters](https://www.bctengineer.com/question.md?key=semester_6%2Fbuilding_technology%3Adoor-types-by-shutter) — Building Technology, chapter 6, asked 2×
- [Short note: Louvered and revolving doors](https://www.bctengineer.com/question.md?key=semester_6%2Fbuilding_technology%3Ashort-louvered-revolving-door) — Building Technology, chapter 6
- [Functions of openings; door and window types](https://www.bctengineer.com/question.md?key=semester_6%2Fbuilding_technology%3Aopenings-functions-working) — Building Technology, chapter 6
- [General parts of doors and windows](https://www.bctengineer.com/question.md?key=semester_6%2Fbuilding_technology%3Adoor-window-parts) — Building Technology, chapter 6, asked 2×
- [Door/window components and door types](https://www.bctengineer.com/question.md?key=semester_6%2Fbuilding_technology%3Adoor-window-components-types) — Building Technology, chapter 6

## Related in other subjects

- [Feature-based modelling and sketch-based operations](https://www.bctengineer.com/question.md?key=semester_4%2Fcomputer_aided_design%3Afeature-based-modeling-operations) — Computer Aided Design, chapter 5
- [DNS and its working mechanism](https://www.bctengineer.com/question.md?key=semester_7%2Fdistributed_system%3Adns-working) — Distributed System, chapter 2, asked 3×
- [Working mechanism of WDM](https://www.bctengineer.com/question.md?key=semester_5%2Fdata_communication%3Awdm-working) — Data Communication, chapter 6
- [Two-room building: brick plinth, door shutters, plaster](https://www.bctengineer.com/question.md?key=semester_7%2Festimating_and_costing%3Abuilding-m-two-room-three-items) — Estimating and Costing, chapter 6