EC fans Archives - Swiss Rotors

(function(){ // Run after DOM ready document.addEventListener('DOMContentLoaded', function() { // Helper: find the content controlled by a button function getContentForButton(btn) { const ctl = btn.getAttribute('aria-controls'); if (ctl) return document.getElementById(ctl); // fallback: look for sibling/menu-content return btn.closest('.e-n-menu-item')?.querySelector('.e-n-menu-content') || null; } // Close a single button/menu function closeButton(btn) { const content = getContentForButton(btn); if (content) content.style.display = 'none'; btn.setAttribute('aria-expanded', 'false'); btn.classList.remove('e-n-open'); btn.closest('.e-n-menu-item')?.classList.remove('e-n-open'); const opened = btn.querySelector('.e-n-menu-dropdown-icon-opened'); const closed = btn.querySelector('.e-n-menu-dropdown-icon-closed'); if (opened) opened.style.display = 'none'; if (closed) closed.style.display = ''; } // Open a single button/menu function openButton(btn) { const content = getContentForButton(btn); if (!content) return; // let CSS pick the display where possible; otherwise force block content.style.display = ''; if (getComputedStyle(content).display === 'none') content.style.display = 'block'; btn.setAttribute('aria-expanded', 'true'); btn.classList.add('e-n-open'); btn.closest('.e-n-menu-item')?.classList.add('e-n-open'); const opened = btn.querySelector('.e-n-menu-dropdown-icon-opened'); const closed = btn.querySelector('.e-n-menu-dropdown-icon-closed'); if (opened) opened.style.display = ''; if (closed) closed.style.display = 'none'; } // Close every menu except optional `exceptBtn` function closeAll(exceptBtn) { document.querySelectorAll('.e-n-menu-dropdown-icon[aria-expanded="true"], .e-n-menu-dropdown-icon.e-n-open') .forEach(btn => { if (btn === exceptBtn) return; closeButton(btn); }); } // Toggle function toggleButton(btn) { const isOpen = btn.getAttribute('aria-expanded') === 'true' || btn.classList.contains('e-n-open'); if (isOpen) closeButton(btn); else { closeAll(btn); openButton(btn); } } // Use event delegation so this works even if the menu is injected later document.addEventListener('click', function(e) { const btn = e.target.closest('.e-n-menu-dropdown-icon'); if (btn) { e.preventDefault(); e.stopPropagation(); // avoid immediate document click close toggleButton(btn); return; } // Click outside any menu item -> close all if (!e.target.closest('.e-n-menu-item')) { closeAll(); } }, true); // Also allow Escape to close menus document.addEventListener('keydown', function(e) { if (e.key === 'Escape') closeAll(); }); // Optional: handle touchstart to make mobile feel snappier document.addEventListener('touchstart', function(e) { const btn = e.target.closest('.e-n-menu-dropdown-icon'); if (btn) { e.stopPropagation(); toggleButton(btn); } else if (!e.target.closest('.e-n-menu-item')) { closeAll(); } }, {passive: true}); }); })(); .e-n-menu-item .e-n-menu-content { display: none; } /* optional visual class when open */ .e-n-menu-item.e-n-open > .e-n-menu-content { display: block; }

Transformation of the fan – from DDIW to EC

Perpetrual transformation Over the past 15 years, significant changes have been made to the design of fans used in the HVAC industry, in particular in air handling units. The solutions have undergone such changes that many people, seeing at the same time a fan used in an air handling unit until recently and an analogous […]

Principles of the radial backward-curved fan

Choosing the right fan is probably one of the most crucial moments in designing or configuring a ventilation device, regardless of its type or purpose. In the case of an air handling unit, the correct selection of this critical component will have a decisive impact on the overall efficiency of the ventilation system, the costs […]