Resistant, Versatile, Ease of use

Manual and Fire Doors

Internal or external manual doors are very common and feature in every building. These can become worn, damaged and starting losing their self closing strength over time. A simple repair can usually resolve any issue and put the door back into full working order. Door material usually in wood, aluminum or steel, with or without lite kits and glass, or windows.

Internal fire doors help slow the spread of fire & smoke allowing vital extra time to make your exit from the property. Most new builds require the addition of Fire doors. All fire doors are CE Marked and tested to BS EN 1634-1.

Existing fire doors can be upgraded by installing new panic bar systems and latching points on to existing fire doors to create a safe means of exit.

Full or partial glass doors are ideal for well traveled corridor doors. We make sure that windows comply with Part M regulations on minimum zones of visibility. It is essential that the doors have a window to provide safety and allow others to see people on either side of the door.

Full glass doors, offer additional source of natural light, and can add aesthetic and monetary value to a building. They work well with full glass partitioning, offering an office with open plan views.

Make your first impression count

Your storefront, door or window, is your opportunity to show your customers who you are, display your products and services, and to promote your business.  

You want this first impression to be a good one, so it’s essential that when it comes to your shop front, the materials used, and the workmanship of the final installation is of the highest quality. 

Now might be the time to think about adding glass to your storefront, or maybe you’re a foreman/contractor working on a new construction site and you’re looking for shop front specialists?  

Whatever the instance, you need a company you can trust, a team you can rely on.  A commercial glass contractor who has the experience and the skill to put your mind at rest that this part of the project is in good hands. 

You need, Crucial Engineering. 

Call our team today on 03451 930 420 and see how others are saving money and reaping the quality rewards. 

Safety Standards

Whether you’re looking into security doors, windows, or even grilles, the first thing to ensure is that they meet the Loss Prevention Certification Board (Standard 1175).  This standard is essential in helping to guarantee the safety and security of your employees. 

The LPCB provides information on the level of security such equipment provides, putting your mind at rest that your goods and services are protected and safeguarded at all times. 

This particular standard is well known throughout government departments and buildings as the high standard of choice for protecting assets and employees.  

What’s more, the police also recognise this standard as high quality, and insurance companies look more favourably on businesses who invest in such quality rated products.   

With LPCB, you are guaranteed to receive a good level of protection. 

Keeping unwelcome visitors out

Ultimately, that’s the name of the game.  And the reason why many businesses invest so much time and money into the right security doors for their premises. 

Categorised under LPS 1175 is intruder-resistant products, which then goes on to include eight different ratings.  

A point to remember is that the higher the rating, the higher the security level that a particular piece of equipment will provide. 

To find the right security level and therefore rating for your business, you should carry out robust risk assessments to identify all potential threats to your business premises, how likely these are to occur, and what equipment will best mitigate these risks asap. 

In the tables below, we’ve listed the security and LPCB LPS 1175 ratings to understand certification and which level will suit your requirements most. 

Security Levels and LPS 1175

As we’ve mentioned, the higher the rating, the higher the level of security.  This is also the same for the security levels recognised under LPS 1175, with SR1 cited by LPCB as the lowest level of security. 

Within the SR1 level, products within this category must withstand forced entry attempts using minimal tools.  To test the suitability in this category, testers will typically use tools within category A (listed above); however, the tools usually used for testing, includE a screwdriver, knives, and spanners, and entry will be attempted for approximately a minute, over a period of five minutes. 

SR2, therefore, is a little more heightened security, and testing is a little more forceful.  Equipment suitable for a rating of SR2 must withstand a forced entry attempt of up to three minutes. The tools used in this scenario will come from category B (again, any items from the lists mentioned above). 

Both of these security levels, SR1 and SR2, are suitable for businesses where items inside the building total a few thousand pounds only.  And for businesses located in highly populated areas where if there is a noise that resembles a disturbance, someone nearby is likely to be alerted.  Typically found in office blocks and small commercial shops. 

At Crucial Engineering, we can help you to find the perfect security doors for your business.  Providing you with suitable rated doors, windows, and grilles, all of our doors are fully certified, and our installers experienced. 

We then move on to security level SR3.  For a piece of equipment to be rated at SR3 standard, it must withstand an opportunist attack for up to five minutes.  Larger tools to gain entry are often used on these types of doors, such as crowbars, hammers, even cordless drills, and we’ve even known gas torches to be used! 

If you’re aware that your business is a prime target for thieves and vandals, SR3 certified external security doors and windows will be the best and the most suitable option for you. 

SR4 and SR5 are robust pieces of equipment.  Able to resist attempts at forced entry for up to ten minutes, SR4 standard equipment is tested using tools from category D (those most likely to be used by an experienced thief). 

SR5 uses testing tools from category D+ and can include items such as cordless disc grinders and reciprocating saws! 

Crucial Engineering’s range of security doors within this category can offer a great level of protection, especially if you have identified your building as a high-risk establishment. 

Equipment rated within the categories of SR6, 7, and 8 offer the highest level of protection. 

Repeated testing attempts are tried on these doors using a range of tools from category E.  

SR6 products must withstand at least ten minutes worth of attempted attack, with SR7 also enduring similar times but over a 30 minute test period (tools from category F can also be used in these instances). 

SR8 must withstand twenty minutes of assault from a testing expert using category G tools! 

An interesting point is that currently, there is no suitable product rated at the SR7 and SR8 standard presently on the market, and these exist to provide innovative engineers a standard to aim for. 

It is highly unlikely that any business, even government agency, will require a higher security level than SR4. 

Fire Resistant Equipment Standards 

Fire-resistant doors and windows aren’t just nice to have; they’re a MUST HAVE. They’re essential pieces of equipment that help to keep both you and your employees safe. 

Fire-rated doors are essential emergency doors required for all commercial premises, offices, factories, warehouses, schools, etc. 

In the UK, good fire doors should hold the kitemark of Certifire – an independent, widely recognised, third-party certification. 

Doors that offer maximum safety can provide an important element of time if a fire breaks out. 

However, for a fire door to achieve such a rating, it must be rigorously tested with a furnace test carried out, subjecting the door to temperatures reaching 1,100 degrees Celsius for the required length of time. 

When smoke begins to show from doors or when the door is compromised in some form, the test ends. 

If neither of these things happens, the test will automatically end after 240 minutes, which is the maximum length of time required for a Certifire rating. 

FD identifies Certifire ratings and then a number such as 30, 60, 120, and 240.  As you might have guessed, this number represents how many minutes of extreme heat and fire the door can withstand. 

Investing in doors with Certifire ratings helps to keep everyone’s mind at ease.  It also provides peace, knowing that the fire doors included within the premises are the most suitable ones for the type of work you carry out and the type of environment you operate within. 

Typically, office blocks and buildings find that a lower Certifire rating door is more than adequate. In contrast, warehouses and factories opt for a higher rating due to more industrial machinery and equipment being housed inside. 

Looking at your risk assessments and your internal fire procedures, it is also a good idea to know how long your business requires to completely evacuate in case of a fire or emergency.  This time can then be weighed up against the ratings of fire doors, and the additional minutes you may require to guide everyone out of the building safely. 

For fully approved and certified fire doors, look no further than Crucial Engineering.  With a wide mix of tested and assured doors available, we have the perfect choice for you and your business premises. 

For a company, you can trust 100% to supply and install fire and safety doors you can rely on, call our team today on 03451 930 420, and find out more. 

Crucial Engineering maintenance agreement. Here for you 24/7 365 days a year.


Title Address Description
York, UK
Selby YO8, UK
Goole, UK
Doncaster, UK
Hull, UK
Lancaster, UK
Harrogate, UK
Blackpool, UK
Preston, UK
Blackburn, UK
Burnley, UK
Halifax, UK
Leeds, UK
Southport, UK
Chorley, UK
Huddersfield, UK
Rochdale, UK
Bolton, UK
Wigan, UK
St Helens
St Helens, Saint Helens, UK
Liverpool, UK
Metropolitan Borough of Wirral, UK
Widnes, UK
Runcorn, UK
Sheffield, UK
Rotherham, UK
Manchester, UK
Metropolitan Borough of Stockport, UK
Warrington, UK
Ellesmere Port
Ellesmere Port, UK
Northwich, UK
Macclesfield, UK
Chesterfield, UK
Deeside CH5, UK
Crewe, UK
Stoke-on-Trent, UK
Telford, UK
Wolverhampton, UK
Walsall, UK
Tamworth, UK
Birmingham, UK
Solihull, UK
Coventry, UK
Worcester, UK


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